Abstract
Recently, polysaccharides have attracted tremendous interest as potential candidates to develop promising high-energy dense polymers through the chemical functionalization of their structures. Therefore, chitosan nitrate (CSN), as an energetic polysaccharide was fabricated by nitration of chitosan (CS) derived from shrimp Parapenaeus longirostris shells. The physicochemical, structural, and thermal features of the designed energetic CSN and its precursors were elucidated by density measurements, elemental analysis, FTIR, SEM, TGA, and DSC experiments. The mechanical sensitivities and calorific energy of the produced CSN were also determined and its theoretical detonation performance was computed using the EXPLO5 V6.04 software. The results demonstrated the efficiency of the performed method to produce the desired CSN with attractive characteristics such as a density of 1.701 g/cm3, nitration content of 16.55%, impact sensitivity of 15 J, heat of combustion of 10,610 J/g, detonation velocity of 7764 m/s, and specific impulse of 242 s, which are better than those of commonly used nitrocellulose (NC). Besides that, new energetic CSN/NC polymer blends with different mass ratios (CSN:NC (wt%) = 25:75, 50:50, and 75:25) were elaborated and characterized in terms of their chemical structure, thermal behavior, and energetic performance. Experimental findings highlighted the attractive properties of the developed CSN/NC blends, providing evidence for the excellent synergistic effect between energetic CSN and NC polymers. Finally, this work established that shrimp shells wastes could serve as valuable biomass for the production of promising insensitive and high-energy dense polysaccharide, which is expected to be widely employed in the next generation of energetic formulations.
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Introduction
Recently, the world has been affected by a considerable increase in petroleum costs combined with predictions of future scarcity and unavailability. In this regard, the valorization of sustainable and renewable biomass for the development of energy-rich materials has become a vast area of research globally (Reshmy et al. 2022; Tarchoun et al. 2022c). Among the accessible renewable and sustainable biomaterials, a special focus has been given to the exploration of polysaccharides as promising alternative biopolymers to substitute non-biodegradable and toxic fossil fuels (Nasrollahzadeh et al. 2021; Mohanty et al. 2022). Plentiful sustainable and environmental-friendly polysaccharides comprising cellulose, chitin/chitosan, starch, gum, alginate, and pectin have garnered substantial interest for applications in several industrial sectors owing to their outstanding structural and physicochemical features, biocompatibility, abundant availability, ease of modification, and promising potentials (Nasrollahzadeh et al. 2021). Among the interesting naturally occurring polysaccharides, chitosan (CS) is the second most abundant carbohydrate biopolymer on earth after cellulose, and it is conventionally prepared by deacetylation of chitin (CT) under alkaline treatments (Negm et al. 2020; Rashki et al. 2021). Structurally, CS is a linear polyaminosaccharide of β-(1,4)-linked D-glucosamine units, with the main difference compared to the chemical structure of cellulose and chitin is the presence of primary amine (NH2) functional group, bonded to the C2 positions, rather than hydroxyl and acetyl groups, respectively. Importantly, this reactive amino functionality-bearing CS has become an ideal support, compared to other biopolymers, for its unique applications to design innovative bio-based products with advanced functionalities (Flórez et al. 2022; Bhardwaj et al. 2021). Regarding the production area, the CS market is escalating exponentially, expected to reach US$63 billion by 2024, while crustaceans (e.g. lobsters, shrimp, crabs, krill, barnacles, crayfish) are the most widely exploited sources to meet the growing demand (Joseph et al. 2021; Begum et al. 2021). In fact, the Algerian coastline, which extends over 1200 km of the Mediterranean, constitutes an ecological system rich in shrimps of Parapenaeus longirostris variety, which is a potential underutilized source of CT and CS (Benhabiles et al. 2012; Ben Seghir and Benhamza 2017). Therefore, the valorization of the discarded remnants from shrimp shells can become, in case of investment, a center of crucial economic interest for the industry of CT- and CS-based derivatives. Depending on the biomass source, different purification and pretreatment processes are performed to generate CT, which will be subsequently used to produce CS (Mohan et al. 2020; Huet et al. 2021). Conventionally, the preparation procedure of CS usually requires three main stages, which are (I) demineralization, (II) deproteinization and deacetylation reactions, respectively (El Knidri et al. 2018). The first step focuses on the elimination of minerals such as magnesium and calcium carbonates using mineral acid, whereas the second one consists of removing proteins through alkaline treatment. In certain extraction procedures, bleaching treatment with organic solvent is also performed to remove pigments (Pal et al. 2021). The deacetylation of CT to produce CS is usually achieved by alkaline hydrolysis of the acetamide groups. Based on the degree of deacetylation (DDA), CS can be classified into a low-deacetylated CS (DDA: 50–70%) and high- deacetylated CS (DDA: 70–99%), opening an extensive range of possibilities to produce CS with tailored features, which have broadened its usage as a promising nitrogen-rich polysaccharide in a wide spectrum of fields such as food, medicine, pharmaceutics, electronics, biofuels, and will undoubtedly continue to find ways to other emerging uses (Joseph et al. 2021; Ahmad et al. 2020).
Regarding the research area of energetic polysaccharides, nitrate ester cellulose, commonly known as nitrocellulose (NC), has been so far the most popular energy-rich polymer used in multiple civilian and defense sectors owing to its attractive performance such as high energy, explosiveness, and good compatibility with other additives (Dou et al. 2022; Trache and Tarchoun 2019). In addition to NC, several new cellulose-based energetic polymers with enhanced performance have been synthesized and studied (Dou et al. 2022). For instance, it is demonstrated in our recent investigations that the structural and molecular modifications of the basic structure of ordinary cellulose are a powerful methodology to develop new energetic cellulose-rich polymers such as nitrated amine-functionalized cellulose, nitrated carbamate-modified cellulose, and nitrated azide-functionalized cellulose, which possess potential applications in the fields of solid propellants and explosives (Tarchoun et al. 2020a, 2021b, 2022d). Therefore, the highly attractive performance obtained for the developed energetic cellulosic materials has motivated us to investigate other reactive polysaccharides, mainly CS, to pave the way toward the next generation of high-energy polymers.
To the best of our knowledge, a few attempts have been undertaken to convert CS into energetic chitosan nitrate (CSN) derivatives. Hirano in 1986, synthesized nitrochitosan by nitration of natural CS using fuming nitric. Two decades later, Liu et al. (2001) and Zhang et al. (2003) prepared CSN with an acid procedure in order to be employed as an intermediate for semi-interpenetrating polymer network production. Actually, CSN is utilized in the removal process of heavy metals, as a cross-linking agent, and in electrochemical devices (Rahman et al. 2019; Jha et al. 2013). However, the adopted nitration method in the previously mentioned references produced CSN with a low nitration level, which strongly affects its properties and applicability features as a high-energy polysaccharide. As a consequence, highly nitrated chitosan has been recently designed through electrophilic nitration of commercially available CS (Li et al. 2020; Tarchoun et al. 2022b). Compared to the conventional NC, this energetic nitrogen-rich polysaccharide demonstrated improved energetic performance with great potential application in solid rocket propellants and composite explosives. The outstanding characteristics of highly substituted CSN have also encouraged us to investigate its blending with NC and scrutinize the characteristics of the obtained energetic CSN/NC composites, which is expected to be an excellent reference for the development of new high-performance formulations based on nitrated polysaccharides.
The novelty of the current work is the valorization of marine co-products, particularly the Parapenaeus longirostris shrimp shells generated after food processing, to develop a promising insensitive and high-energy dense polysaccharide through electrophilic nitration of the extracted chitosan. The produced energetic CSN and its corresponding precursors were subjected to several structural and thermal analyses. Moreover, the sensitivity features, the heat of combustion, and the detonation performance of the designed CSN have been determined and compared to those of conventional nitrocellulose. In addition, new energetic polymer blends based on CSN and NC were fabricated and deeply characterized to offer helpful guidelines for their potential utilization in composite explosives and solid propellants.
Experimental section
Materials
In this study, the discarded remnants from shrimp Parapenaeus longirostris shells after food processing were employed as raw material to extract CT and CS derivatives. NC, with a nitrogen content of 12.61%, was synthesized at EMLab as previously mentioned by Tarchoun et al. (2021b). Hydrochloric acid (HCl, 37%), sodium hydroxide (NaOH), hydrogen peroxide (H2O2, 30%), fuming nitric acid (HNO3), acetic anhydride (Ac2O), and sodium bicarbonate (NaHCO3) were purchased from VWR-Prolabo and used without further purification.
Preparation procedure of chitosan nitrate
The shrimp waste was collected and the shells were thoroughly washed with distilled water to remove all impurities, followed by prolonged air-drying for two weeks. The dried shrimp shells were ground to a fine powder. Next, chitin (CT) was extracted following a multistep process. Firstly, demineralization was performed using 1 M HCl at a solid-to-liquor ratio of 1/30 (w/v), followed by deproteinization with 3 M NaOH at the same ratio (Srinivasan et al. 2018). CT, without pigments, was obtained after treatment with 15% H2O2 at a solid: liquid ratio of 1:100 (w/v). Each extraction step was carried out under agitation at room temperature for 75 min and followed by washing with distilled water, filtration, drying and finally grinding. After that, the isolated CT, with a yield of 25.63% and density of 1.551 ± 0.003 g/cm3, was deacetylated, through alkali hydrolysis, using 50% NaOH at 80 °C for 4 h under stirring (Srinivasan et al. 2018; Marei et al. 2016; Teli and Sheikh 2012). The deacetylation was repeated two times, and the obtained solid residue was then successively washed with distilled water and ethanol until neutral PH, and oven-dried in an oven to afford the corresponding CS (yield of 88.79% and density of 1.564 ± 0.002 g/cm3) with DDA of 88.43 ± 0.84%. CT: Anal. found (%): C 46.58, H 6.25, N 6.64; calcd. (%): C 47.29, H 6.40, N 6.90. CS: Anal. found (%): C 43.84, H 6.25, N 8.21; calcd. (%): C 44.72, H 6.83, N 8.70.
Lastly, chitosan nitrate was synthesized according to the method described in our recent paper (Tarchoun et al. 2022b). Briefly, the nitration reaction was carried out in an ice bath for 5 h in an aqueous Ac2O solution using fuming HNO3 as a nitrating agent. The proportions used were 1/7 (w/v) CS to HNO3 and 1/1 (v/v) Ac2O to HNO3. The mixture was then filtered and the resulting product was neutralized, respectively, by a solution of NaHCO3 (2%, w/v) and distilled water in order to remove residual acids. The neutralization process was accomplished at 80 °C for 2 h, and the final product was filtered and dried under vacuum. The experimental procedure of the preparation is illustrated in Fig. 1. CSN: Anal. found (%): C 23.83, H 2.48, N 16.55; calcd. (%): C 24.32, H 2.70, N 18.92.
Elaboration of CSN/NC blends
With the aim of studying the synergistic effect of CSN and NC, energetic CSN/NC polymer blends with different mass ratios (CSN: NC (wt%) = 25:75, 50:50, and 25:75) were elaborated. As depicted in Fig. 1, well-determined amounts of the dried samples were dissolved in acetone under stirring at room temperature. The solution was then poured into a petri dish and dried in the open air until solvent evaporation, and the considered composites were recovered. The samples are labeled as CSN 25% NC 75%, CSN 50% NC 75%, and CSN 75% NC 25%.
Apparatus and methods
Fourier transform infrared spectroscopy (FTIR) was carried out with a Perkin Elmer 1600 spectrometer within the wavenumber range of 4000 − 400 cm–1 by averaging 32 scans at a resolution of 4 cm–1. Elemental analyses were recorded using a Vario III Elemental analyzer. Scanning electron microscopy (SEM) images were performed with scanning electron microscopy (SEM) of Carl Zeiss SIGMA. Experimental densities were measured using an electronic Accypyc 1340 II densimeter. Thermogravimetric Analysis (TGA) and differential scanning calorimetry (DSC) experiments for about 1–2 mg samples under nitrogen gas were conducted using Perkin-Elmer TGA 8000 and DSC 8000 analyzers, respectively, over the temperature range of 50–350°C at a heating rate of 10°C/min. Impact and friction sensitivities (IS and FS) were determined by BAM drop hammer and friction tester according to the STANAG 4489 and STANAG 4487, respectively (NATO 1999, 2002). The reported values of IS and FS correspond, respectively, to the lowest energy and force at which a positive result can be obtained from at least one out of six repeated tests. The heat of combustion (ΔcU) of the designed CSN and its blends with NC were measured using a Parr 6200 bomb calorimeter under 30 bar of oxygen atmosphere. Their theoretical energetic parameters were also predicted using the EXPLO5 (V6.04) thermodynamic code (Sućeska 2017).
Results and discussion
Physico-chemical properties of the extracted CT and CS
In this study, the CT yield, calculated by the dry weight ratio between the extracted chitin and raw shrimp shells, was found to be 25.63%, which is in good agreement with the values previously reported for CT isolated from crustaceans (Benhabiles et al. 2012; Saravana et al. 2018). Moreover, to further elucidate the characteristics of the isolated CT and CS, physicochemical analyses were performed to determine the density, nitrogen, moisture, and ash contents of each extracted sample (CT and CS). The measured experimental densities reveal that CS has a better density (ρ = 1.564 ± 0.002 g/cm3) than its CT precursor (ρ = 1.551 ± 0.003 g/cm3), indicating that the amine groups (NH2) of CS contribute better to the density of this biopolymer than the acetyl function of CT. Furthermore, the nitrogen content of the prepared CT (Nc = 6.64%) from local shrimp Parapenaeus longirostris shells is found to be close to the theoretical value (Nc = 6.90%), calculated for completely acetylated CT, demonstrating its high purity and the effective removal of protein during deproteinization process (Saravana et al. 2018). It is also revealed that the nitrogen content increased from CT to CS (Nc = 8.21%), which is attributed to the conversion of the acetamide (–NHCOCH3) groups of CT to amino (–NH2) ones during alkaline deacetylation (Benhabiles et al. 2012). Besides that, the moisture and ash contents of the investigated samples were determined according to the methods detailed in our previous paper (Tarchoun et al. 2019a). The moisture content of the extracted CT and CS are obtained as 3.35% and 5.89%, respectively, which falls within the acceptable United States Pharmacopoeia limit of moisture content (≤ 7%) (Tarchoun et al. 2019a, b). These low values also indicate the suitability of the prepared CT and CS from local shrimp Parapenaeus longirostris shells as adsorbent derivatives for pharmaceutical and biomedical applications (Liakos et al. 2021). In addition, experimental results show that the obtained CT and CS contain reduced ash content (CT: 0.36% and CS: 0.68%) of less than 1%, indicating the reduced amount of calcium carbonates and other minerals from the original source, and confirming once more their high-quality grade (Trung et al. 2020; Phuong et al. 2022). Therefore, we can conclude that shells, derived from local shrimp Parapenaeus longirostris species, could be considered promising marine biomass to produce high-quality polysaccharides (CT and CS).
Structural characteristics
The chemical functionalities of the designed CSN and its CS and CT precursors were identified by infrared spectroscopy, and the obtained spectra are shown in Fig. 2a. The extracted CT exhibits the typical vibrational bands of N-acetylglucosamine units (2-acetamino-2-deoxy-β-d-glucopyranose), comprising O–H elongation at 3450 cm− 1, N–H stretching at 3280 cm− 1 and 3097 cm− 1, C–H elongation at 2900 cm− 1, amide I stretching of C = O at 1655 cm− 1 and –NH bending at 1628 cm− 1, amide II elongation of C–N band at 1550 cm− 1, asymmetric and symmetric CH2 bending at 1378 − 1309 cm− 1, skeletal vibrations involving the C–O stretching at 1020–1080 cm–1, and ß-1,4-glycosidic linkage vibration at 890 cm− 1 (Kumari et al. 2017; Yuan et al. 2020). The CS spectrum is found to be similar to that of CT, with the most detailed difference related to the obvious decrease of the characteristic absorption bands of acetyl groups, consisting of the fact of a high DDA after alkali treatment. As a result, more NH2 groups are exposed in the as-prepared CS sample. Furthermore, the spectra of the extracted CT and CS from local shrimp Parapenaeus longirostris shells are analogous to those of the commercially available chitin and chitosan (CT–C and CS–C) and those derived from other natural resources (Mohan et al. 2020; Aili et al. 2017; Doğdu et al. 2021). In addition, the degree of deacetylation of the prepared CS was calculated from the IR spectrum of CS by recording the absorbance at 1655 cm− 1 for amide I (A1655) and 3450 cm− 1 for the OH group (A3450), following the most appropriate method proposed by Domszy and Roberts (DDA (%) = [1- (A1655/ A3450)/1,33] × 100) (Domszy and Roberts 1985; Kasaai 2008). It is important to point out that CS–C with a DDA of 98% is considered a reference to confirm the precision of this method. Compared to the value provided by the manufacturer, the calculated DDA of CS–C is found to be 97.43 ± 0.65%, justifying the excellent reliability of the followed IR approach. Interestingly, the prepared CS presents a high DDA of 88.43 ± 0.84%, indicating that the deacetylation efficiency of CT derived from shrimp shells is favorable compared to other raw biomass (Kumari et al. 2017; Francis et al. 2021). However, it must be taken into account that the DDA of the obtained CS depends on several factors, such as the nature of the organism from which it was extracted and the conditions employed in the extraction process. These supportive results demonstrate once more that the envisaged polysaccharides are successfully achieved with high purity.
After nitration, we can reveal from Fig. 2a that the obtained CSN displays the typical IR profile of nitrocellulose, except for the occurrence of the weak N–NO2 vibrational band at 1428 cm–1 in CSN (Tarchoun et al. 2022b; Li et al. 2020). Furthermore, it is clear that the significant changes that occurred in the molecular structure of CSN compared to its precursor corresponded to the appearance of the characteristic absorption peaks of nitro (NO2) at 1640 cm–1 and 1280 cm–1, and nitrate ester (O–NO2) at 835 cm–1, as well as the obvious decrease in the intensity of O–H and N–H bands. These results confirm the successful electrophile substitution of hydronium ions (H+) of accessible hydroxyl and amine sites of glucosamine units with nitronium (NO2+) ones without the destruction of the main polymer framework during the whole nitration. Regarding the spectra of the developed CSN/NC blends plotted in Fig. 2b, most of the vibrational bands appeared at the same wavenumbers as presented in the CSN and NC, highlighting their excellent chemical compatibility. However, the disappearance of some vibrational bands of CSN in all CSN/NC spectra is attributed to their overlapping with NC peaks since the selected energetic polysaccharides have similar chemical structures. Other interesting results from Fig. 2b correspond to the intensification of the representative peaks of NO2 and O–NO2 as well as the decrease in the intensity of the OH band in CSN/NC blends as compared to raw CSN and NC, which can be explained by hydrogen bonding and electrostatic N–O interactions between the two energetic polymers. In this subject, some authors stipulated that these interactions would improve the safety performance of the prepared energetic mixture (Mezroua et al. 2022; Guo et al. 2017; Touidjine et al. 2022), as will be proved later through sensitivity measurements. Additionally, these outcomes highlight that no specific alteration in the chemical structures of CSN or NC was caused by the fabrication process.
Morphological features
The morphology and surface physical state of the starting shrimp shells and their CT, CS, and CSN derivatives were analyzed using SEM to probe the eventual morphological changes caused by the performed chemical treatments. As can be seen from Fig. 3, the raw shrimp shell sample displays a tightly arranged structure, which may be due to the presence of attached chitin and protein layers and mineral salts (Zhao et al. 2019; Saravana et al. 2018). Indeed, according to previous studies, CT is a chief element of the shell reticular skeleton, and the inside flexible protein macromolecules are unevenly attached to the CT backbone, while inorganic compounds are toughly entrenched in CT chains (Lavall et al. 2007; Saravana et al. 2018). However, after chemical treatment, the isolated CT exhibits detached thin sheets with uniform lamellar structure, indicating that the performed extraction process leads to the removal of proteins and minerals from the shell of shrimp Parapenaeus longirostris wastes, and hence the CT sheets are obtained. An earlier report on the extraction of CT from crustacean waste showed that the parallel CT chains are arranged in bonded piles or sheets by hydrogen interactions through the amide groups (Saravana et al. 2018). After deacetylation, the obtained CS appears to have a rough irregular microstructure with rod-like aggregates, which is attributed to the alkaline hydrolysis during the deacetylation process that caused the disintegration of the crosslinking bonds between CT chains and the elimination of acetyl moieties (Phuong et al. 2022). It is interesting to point out that the microscale morphologies of the CT and CS, prepared in this work from shrimp Parapenaeus longirostris shells, are comparable to those obtained from deep-sea mud shrimp (Rasweefali et al. 2021), Penaeus notialis shrimp shells (Olaosebikan et al. 2021), aquatic invertebrates (Kaya et al. 2014), and crab shells (Kumari et al. 2017). After nitration, CSN presents a rod-shaped and granular structure with a rougher surface and larger agglomeration, which is related to the chain bundling caused by the presence of electron-withdrawing O–NO2 and N–NO2 groups that cover the surface of glucosamine units. This finding also indicates that the performed nitration process leads to a uniform and homogenous distribution of NO2 groups with a negligible morphological alteration.
In the case of the as-prepared energetic blends, it can be clearly noticed from Fig. 3 that all CSN/NC composites exhibit an eventual continuous phase system. Compared with that of CSN and NC, the microstructure of the prepared CSN/NC blends significantly changed from the irregular rod-shaped morphology of CSN and the fibrous aspect of NC to a uniform structure with a smooth surface. This finding highlights the effective dissolving process of CSN/NC mixtures to form dense matrices. Another interesting result is that the obtained sheet structure after the casting process is likely promoted by increasing the mass ratio of CSN. Such effective interfacial contact between the two energetic polymers is expected to improve the thermal decomposition performance of the energetic blends, as will be confirmed later in the paper by TGA and DSC analyses. Moreover, the observed small cavities at the sheet surface of CSN/NC blends are attributed to the evaporation of the tiny acetone drops already stacked at the surface. Besides that, all the prepared CSN/NC blends exhibit good continuity and no obvious defects are detected, demonstrating that they have good quality.
Thermal analysis by TGA
The thermal decomposition behavior of the investigated bio-based polymers (CT, CS, and CSN) derived from shrimp Parapenaeus longirostris shells biomass, as well as NC and the as-prepared CSN/NC blends were assessed by TGA, and the recorded thermograms are reported in Fig. 4. As can be perceived from TGA/DTG curves plotted in Fig. 4a, the extracted CT and CS present an initial small weight loss at 80–140 °C assigned to the moisture evaporation, followed by an important decomposition stage, in the temperature range of about 260–380 °C, attributed to the degradation of polysaccharide framework through multiple processes (Saravana et al. 2018; da Silva Lucas et al. 2021). In the first event, the amount of physically absorbed water of CS (5.3%) is found to be higher than that of CT (2.9%), which is probably due to the hygroscopic nature of amino groups when compared to the acetyl groups of CT (Luo et al. 2020). The second stage corresponds to the degradation of N-acetylated and deacetylated functional groups of CT and CS respectively, as well as the dehydration of their saccharide units. In accordance with the findings of Mohan et al. (Mohan et al. 2020), the onset and maximum peak temperatures of the extracted CS (Tonset = 265.6 °C and Tpeak = 304.3 °C), shown in Fig. 4a, are lower than those of its corresponding CT (Tonset = 280.1 °C and Tpeak = 350.8 °C). This finding is explained by the fact that the N-acetylated polymer units of CT are more thermally stable than the deacetylated units of CS. Moreover, the lower mass loss of the extracted CS (39.6%) compared to its CT precursor (76.9%) was expected as normally reported before, due to the cross-linking of CS during thermal decomposition (Muñoz-Nuñez et al. 2022; da Silva Lucas et al. 2021). In addition, it is interesting to point out that the thermal stability of CT and CS extracted in this work from shrimp shells (Parapenaeus longirostris) is found to be comparable to those from mealworm´s cuticles studied by da Silva Lucas. et al. (2021), those obtained from some insects reported by Mohan et al. (2020), and those prepared from the same shrimp species mentioned by Ben Seghir et al. (2017).
In the case of the synthesized CSN, two overlapping weight loss events were identified in the approximate temperature range of 115–240 °C, similar to the literature reports on the newly developed high-nitrated chitosan (Zhang et al. 2022; Tarchoun et al. 2022b). However, compared to the thermal stability of nitrochitosan reported in these previous papers, it appears from Fig. 4a that the CSN, prepared in this study from local shrimp Parapenaeus longirostris shells, shows enhanced thermal decomposition with 161.2 and 215.1 °C as maximum peak temperatures for the first and second decomposition events, respectively. Moreover, the first mass loss (35.5%), corresponded to the decomposition of explosophoric nitramines and nitrate esters, and the mass loss of the second event (54.8%), related to the decomposition of the polymeric skeleton, are found to be higher than those mentioned in our recent paper for CSN derived from commercially available chitosan acquired from Acros Organics (Tarchoun et al. 2022b). This finding suggests the potential effect of chitosan origin, the processing method, and the nitration conditions on the thermal behavior of the resulting energetic chitosan-rich polymer. Besides that, it is clear from Fig. 4a that NC exhibits an abrupt loss of mass (80.1%) at a maximum peak temperature of 204.3 °C, whereas CSN decomposes in two stages. The reduced thermal stability of CSN compared to conventional NC is originated from the presence of both nitrogen-rich and thermally unstable N–NO2 and O–NO2 functional groups in CSN, which significantly accelerate its thermal decomposition (Tarchoun et al. 2020b; Chen et al. 2022).
Regarding the newly developed energetic mixtures, it is evident from Fig. 4b that all the elaborated CSN/NC blends generate a large single-step mass loss stage within the temperature range of 179.6–233.9 °C, which is interestingly higher than the thermal decomposition of pure CSN. It can be also revealed that the increase of NC content in CSN/NC mixture leads to an improvement of the thermal stability and mass loss, following the trend of its individual compounds. These findings suggest that the NC thermolysis confers thermal resistance to the CSN decomposition by promoting the heat transfer from the reaction zone to the unburned portions, which delays the propagation of the decomposition process (Tarchoun et al. 2022a; Benhammada et al. 2020). On the other, the early decomposition of CSN/NC mixtures compared to the pure NC is due to the released reactive species and energy during CSN decomposition. These outcomes demonstrate that both CSN and NC may promote the decomposition of each other through a synergistic mechanism, and thus such blend may find effective applications as a binder for solid propellants or as an additive to improve the performance of rocket propellants and composite explosives.
Thermal assessment by DSC
In order to advance the investigation of the thermal behavior of CSN and its precursor (CS), and further evaluate the effect of compounding on the stability and thermal properties of the developed NC/CSN blends for use in practical energetic applications, DSC analyses of the mentioned samples were carried out, and the corresponding thermograms are presented in Fig. 5, while the corresponding data are summarized in Table 1. Similarly to the commercial chitosan purchased from Acros Organics, previously studied in our recent work (Tarchoun et al. 2022b), the thermogram of CS, extracted from shrimp Parapenaeus longirostris shells, exhibits a single small exothermic decomposition, with the onset and maximum peak temperatures of 281.4 and 308.1 °C, respectively, reflecting bonds scission within and between glucosamine units of the CS polymer chains (Barbosa et al. 2019; Muñoz–Nuñez et al. 2022).
On the other hand, the substitution of free accessible hydroxyl and amino groups by nitrate esters and nitramines, respectively, in CSN causes a decrease in its thermal decomposition accompanied by an interesting increase of its heat release, due to the transition of its starting temperature of decomposition (from Tonset = 275.4 °C for CS to Tonset = 139.0 °C for CSN) and its enthalpy of reaction (from ∆H = –798 J/g for CS to ∆H = –2198 J/g for CSN). In contrast to CS, CSN presents two consecutive exothermic events within the range of 138–185 °C and 190–235 °C, respectively. the first degradation event, appeared at Tpeak1 = 159.9 °C, is attributed to the thermolytic cleavage of the energetic N–NO2 and O–NO2 groups; while the second one, located at Tpeak2 = 212.6 °C, corresponded to the thermo-oxidative destruction of glucosamine units. Moreover, it is evident from Fig. 5; Table 1 that the produced CSN, in addition to its increased nitrogen content, displays a significantly high heat release with basically acceptable thermal decomposition compared to the conventional cellulose nitrate, indicating its superior performance for potential uses in the fields of propulsion and explosives. Therefore, compared to the TGA/DTG results, similar thermal degradation behavior is recorded by DSC.
As for the DSC thermograms of the developed energetic mixtures plotted in Fig. 5, a single exothermic decomposition peak is observed for all CSN/NC blends, which starts at 181–188 °C and proceeds at maximum temperatures ranges of 201–207 °C. We can also denote from Fig. 5; Table 1 that doping CSN by NC leads to an improvement of the thermolysis process toward higher temperatures. Therefore, all the newly developed CSN/NC mixtures show better thermal stability than pure CSN. Moreover, the integration of peak areas shows that the pyrolysis energy (∆H) released during CSN/NC blends decomposition increases proportionally with the fraction of CSN, highlighting the advantage of adding CSN to overcome the low energy released by NC at its pyrolysis. In fact, CSN/NC blends with a mass ratio in CSN higher than 50% (i.e. CSN 50% NC 50% and CSN 75% NC 25%) reveal higher enthalpy of reaction than pure CSN, which indicates a good synergistic effect between CSN and NC that can be the consequence of the enhanced interfacial contact between CSN and NC matrices, as proved by SEM analysis. This fact also suggests that the burning rate of CSN/NC composites might be improved by the exothermic superficial reactions that occur within the mixture (Mezroua et al. 2022). Additionally, it is important to highlight that the prepared CSN/NC blends have better thermal stability than some reported NC– and CSN-based composites such as NC/GAP (Tpeak = 193°Cat β = 10 °C/min) (Luo et al. 2019), NC/HMX (Tpeak = 168 °C at β = 10 °C/min) (Wang et al. 2016), CSN/RDX (Tpeak = 145–150 °C at β = 10 °C/min) (Li et al. 2020), and CSN/Ti (Tpeak = 153–155 °C at β = 10 °C/min) (Zhang et al. 2022). These interesting outcomes established that CSN could be considered an excellent additive for boosting NC to more interesting energetic proprieties, and show that the NC is satisfactory for the improvement of CSN thermal stability.
Physico-chemical properties, combustion parameters, sensitivity characteristics, and energetic performances
In order to further elucidate the characteristics of the designed energetic CSN and CSN/NC blends, their thermodynamic parameters and energetic performance were evaluated and the determined data are summarized in Table 2. Interestingly, CSN, produced in this study from local shrimp shells, presents outstanding density, nitrogen content, energy of combustion, and mechanical insensitivities, which are remarkably better than those of structurally similar nitrocellulose, as well as comparable to those of high-substitute nitrochitosan recently designed by our research group from commercially available chitosan (Tarchoun et al. 2022b). Moreover, the calculated molar enthalpies of formation (ΔfH) show that the investigated energetic CSN and NC binders have negative ΔfH, highlighting the exothermic reaction of formation of these energetic polysaccharides from the basic elements. Another interesting finding is that the synthesized CSN has a much higher density than the common energetic polymers such as glycidyl azide polymer (GAP: 1.30 g/cm3) (Wu et al. 2020), poly(glycidyl nitrate) (Poly GLYN: 1.46 g/cm3) (Yan et al. 2016), and some emergent energetic poly(ionic liquids) (1.60–1.65 g/cm3) (Wang et al. 2018). In addition, EXPLO5 (V6.04) thermodynamic program was utilized to compute the detonation parameters, according to the Chapman–Jouguet (CJ) theory, and the specific impulse (Isp), calculated under isobaric conditions at 7 MPa, of the studied energetic polysaccharide. Interestingly, the computational data, reported in Table 2, reveal that the designed CSN from shrimp shells has better heat of detonation (ΔEU0), detonation velocity (DC−J), temperature of explosion (TC−J), and Isp than the commonly employed NC, and GAP (ΔEU0= 4307 kJ/kg, DC−J = 6638 m/s, TC−J = 2404 K, Isp = 207 s) (Betzler et al. 2016), which are even superior to those of new energetic nitrogen-rich cellulosic polymers including 6-deoxy-6-(ω-aminoethyl)nitramino cellulose nitrate (ΔEU0= 4774 kJ/kg, DC−J = 7576 m/s, TC−J = 2867 K, Isp = 211 s) (Tarchoun et al. 2020b), azidodeoxy-cellulose nitrate (ΔEU0= 4715 kJ/kg, DC−J = 7533 m/s, TC−J = 3038 K, Isp = 215 s) (Tarchoun et al. 2020c), and 2-(1 H-tetrazol-1-yl)acetate cellulose nitrate (ΔEU0= 4680 kJ/kg, DC−J = 7552 m/s, TC−J = 3033 K, Isp = 212 s) (Tarchoun et al. 2021a). These outcomes highlight the potential valorization of Parapenaeus longirostris shrimp wastes as valuable marine co-products to develop a promising energetic nitrogen-rich polysaccharide (CSN) for futuristic high-performance energetic formulations.
In the case of the newly developed energetic mixtures, an interesting finding that one can reveal from Table 2 is that CSN/NC blends display greater density and energy of combustion than those of pure energetic polymers. The increase of these parameters will certainly enhance the overall performance of the energetic formulation. Furthermore, all the designed CSN/NC blends are found to be friction insensitive; whereas, they show relative impact insensitivity similar to that of CSN but interestingly better than that of NC, benefiting from the synergistic effect and the excellent interfacial contact between CSN and NC. The uniform dispersion of both CSN and NC would also reduce the formation of hot spots, and thus improve the insensitivity of the blend. Another important finding is that all the elaborated CSN/NC blends produce satisfactory ΔEU0, DC−J, TC−J, and Isp parameters, which are boosted with increasing CSN content, showing that the introduction of CSN, even at a low mass fraction (25 wt%), improves the energetic performance of NC. The enhancement of the energetic features means that an effective and highly energetic composite can be designed based on CSN/NC binder. In addition, all the reported CSN/NC blends present better DC−J than some explosives including Trinitrotoluene (TNT: DC−J = 6900 m/s) (Muravyev et al. 2022), and Hexanitrostilbene (HNS: DC−J = 7612 m/s) (Tang et al. 2020), as well as higher Isp than some currently employed solid rocket propellants (Isp ≈ 220–225 s) (Elbasuney et al. 2017; Chalghoum et al. 2022). We can also deduce from Table 2 that, compared to the CSN/NC blend with a mass ratio (wt%) of 50:50. The introduction of 75 wt% CSN does not significantly affect the energetic parameters, which suggests that the optimal fraction is around the equi-mass ((wt%) = 50:50). Based on the above results, we can conclude that both CSN and NC may positively affect the physical stability and the energetic performance of each other via a synergistic effect, and thus such blend can find effective application in the area of solid rocket propellants and explosive.
Conclusions
During this study, we demonstrated that the residues from shrimp Parapenaeus longirostris shells can be effectively valorized to develop a promising energetic nitrogen-rich polysaccharide through electrophilic nitration of the extracted chitosan. The high purity and the successful molecular structure of the designed energetic CSN and its extracted CS and CT precursors were confirmed by elemental analysis and structural measurements. Importantly, the designed CSN from local shrimp shells displayed remarkedly improved density, nitrogen content, heat of combustion, mechanical insensitivities, and energetic performance, as well as fundamentally acceptable thermal decomposition compared to the commonly used NC. Additionally, new energetic blends based on CSN and NC, with different mass ratios (CSN:NC (wt.%) = 25:75, 50:50, and 25:75), were elaborated and fully characterized. FTIR and SEM results demonstrated the homogeneity of the developed CSN/NC blends without obvious defects. Compared to pure CSN and NC, all the prepared CSN/NC blends exhibited increased density, heat of combustion, and enthalpy of reaction. Furthermore, the decomposition temperatures of CSN/NC blends are found to be interestingly higher than that of pure CSN, highlighting the positive effect of the introduction of NC. It was also revealed that all CSN/NC mixtures possess satisfactory impact and friction sensitivities, similar to that of CSN, but attractively better than that of NC. Additionally, the computed theoretical energetic performance showed that the new elaborated energetic blends provide great detonation velocity (7674 m/s ≤ DC-J ≤ 7761 m/s) and specific impulse (241 s ≤ Isp ≤ 248 s), demonstrating that both CSN and NC could effectively enhance the energetic properties of each other through a synergistic mechanism. Above all, we participated through the present study in paving the way toward promising energetic polysaccharide derived from local marine Parapenaeus longirostris wastes, which has not been addressed yet, and we also provided new insights into advantageous characteristics of CSN/NC blends for future applications in advanced high-performance energetic formulations. As such, the interactions of CSN and its chemical compatibility with other additives to develop the next generation of energetic composites should remain among the main foci of the postulated next stage of research on those promising materials.
Data availability
All data supporting the findings of this study are available within the article.
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Tarchoun, A.F., Trache, D., Hamouche, M.A. et al. Elucidating the characteristics of a promising nitrate ester polysaccharide derived from shrimp shells and its blends with cellulose nitrate. Cellulose 30, 4941–4955 (2023). https://doi.org/10.1007/s10570-023-05200-0
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DOI: https://doi.org/10.1007/s10570-023-05200-0