Abstract
This present study discusses the effects of adding moringa gum powder to Cissus quadrangularis fiber–reinforced polyester resin composites on their mechanical, wear, and drop load impact properties. The moringa gum powder was synthesized from the moringa tree, whereas the Cissus quadrangularis fiber was as-received. The composite laminates were manufactured by hand layup process using 40 vol.% of fiber along with 0.5, 1, and 2 vol.% of moringa gum powder. The results revealed that the load bearing properties such as tensile, flexural strength and tensile, flexural modulus were better for composites containing 1 vol.% of moringa gum particle with 40 vol.% of fiber. The Izod impact test reveals that composite designation (moringa gum particles of 1 vol.%) PE3 has the highest impact-absorbing capacity up to 3.75 J. The maximum microhardness value for composite designation PE4 (moringa gum particles of 2 vol.%) is about 84 Shore-D. It is observed that moringa gum toughening with an increase in particles vol.% improves wear characteristics. As well as drop load impact toughness increased by 96% for 1 vol.% of particles. However, further increment up to 2 vol.% of particle decreases the drop load impact toughness. According to SEM (scanning electron microscopy) fractography, and overall performances of composites, adding 1.0 vol.% of moringa gum particle is the better inclusion for producing highly performing composites. These enhanced features of composites, which contain 40 vol.% of fiber and 1 vol.% of particle named as PE3, could be utilized in the automotive and industrial sectors, and they may even be utilized for home decoration purposes.
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1 Introduction
Due to the huge increase in the cost of wood resources, the introduction of alternative sources of fibers, technical innovation, competitiveness, low switching costs, and environmental concerns, the necessity for biocomposites has become essential [1]. Two types of polymers can be found in general: thermoplastics and thermosets. Polypropylene, polyethylene, and polyvinyl chloride are the most widely utilized thermoplastics, whereas phenolic, epoxy, and polyester resins are the most commonly utilized thermosetting matrices. Polyester is a thermosetting polymer that is commonly used in natural fiber–reinforced composites as a polymer matrix [2]. Natural fibers are used because of their features of being renewable, biodegradable, ecologically friendly, cost-effective, and mechanically competitive. Natural fibers like flax, ramie, hemp, and jute have mechanical qualities that are equivalent to synthetic fibers, making them appropriate for usage as a glass fiber substitute in structural composites for automotive components and building materials [3]. Natural fibers can be classified into three main categories based on their sources: seed hair, bast fibers, and leaf fibers [4]. Though many research was carried out on commercially available fibers, the research based on novel newly developed fiber is less. With this, Cissus quadrangularis, tamarind, Spinifex littoreus, and Caryota urens fiber are notable.
Ganesh et al. [5] performed investigation on the mechanical properties of ramie/kenaf fibers under various parameters using GRA and TOPSIS methods. The authors observed that 10 wt.% ramie (R)/10 wt.% kenaf (K) with 5 wt.% benzoyl chloride treatment (T)–based epoxy composites exhibited good mechanical properties with ultimate tensile strength of 37.39 MPa, ultimate flexural strength of 63.53 MPa, and impact strength of 70.36 J/m because of hybridization and the reduction in hydrophilic nature by the surface treatment method. Veeranna et al. [6] studied the mechanical properties of Cissus quadrangularis stem fiber–reinforced isophthalic polyester composites. The result shows improved mechanical properties with increase in Cissus quadrangularis stem fiber content up 25 wt.%. Cissus quadrangularis is a perennial plant belonging to the Vitaceae (grape) family. It comes under the category of bast fiber that has captured the attention of researchers and manufacturers in polymer composite industry. Even in the most unfavorable weather circumstances, they grow quickly. Cissus quadrangularis has long been recognized for its pharmacological properties, and it is commonly used to strengthen bones and repair ligament tears [7]. The anatomical, mechanical, thermal, chemical, and physical properties of Cissus quadrangularis fiber have all been widely studied previously by various researchers.
Natural fibers, on the other hand, have high a cellulose content on their surface. Thus, their bonding between polymers is diplomatic; hence, their contact interfaces with polymer resins are always stronger. Polyester is usually selected as a matrix for high-performance composite making, since it is chemically and thermally stable and due to its abrasion and flammability resistances [8]. Moreover, polyester resin is brittle by nature, which has limited its use in long-term applications. As a result, there has been a lot of interest in finding a way to enhance the toughness of polyester resin. To improve the toughness of this matrix system, a variety of techniques have been used, including the addition of filler particles and natural toughening agents [9]. Glass, ceramics, metals, and other materials are usually employed as fillers in composites. Among various fillers and tougheners, the natural resin gum has gotten a lot of attention because of its low cost, excellent properties, and structural diversity as green “bio-based” renewable material [10]. Ravikumar et al. [11] researched on Moringa oleifera gum composite a novel material for heavy metal removal. The clay-polymer composite made of bentonite clay and gum from Moringa oleifera exhibited significant cadmium, chromium, and lead removal properties in each case. The findings show that clay-polymer composites consisting of MO gum and bentonite clay have a stronger capacity for eliminating metal ions (up to a 100% reduction). The electrical, thermal, and mechanical properties of Phaseolus vulgaris fiber/unsaturated polyester resin composite filled with nanosilica were investigated by Gurukarthik et al. [12]. The authors observed that the composite made of 6vol.% PVF and 1vol.% SiO2 shows better electrical, thermal, and mechanical properties. Mehetre et al. [13] examined the isolation and characterization of bionanofibers from Moringa oleifera gum as a platform for drug delivery. Fourier transform infrared spectroscopy (FTIR) was used to show the hydrolysis reaction of Moringa oleifera and glycosidic bonds. According to the authors, increase in acid content from 20 to 60 wt.% promotes molecular breaking, resulting in narrower and fewer poly-disperse nanofibers.
Thus, based on the previous literatures, a few number of investigations were performed on the Cissus quadrangularis fiber and its composites. Moreover, the combined effect of Cissus quadrangularis fiber and moringa gum powder reinforcements in polyester composite is also not researched previously. Moreover, the mechanical, wear, and drop load impact behavior was also not studied yet for this composite. Hence, the present study was aimed to develop a polyester composite reinforced with Cissus quadrangularis fiber and moringa gum powder for technological applications. Moreover, characterization on mechanical, wear, and drop load impact properties is also done on the composite in order to evaluate the properties. Such mechanically strengthened, wear resistance improved, and highly toughened natural fiber particulate composites could be used in automotive, sports components, domestic appliances, and structural body applications.
2 Experimental procedures
2.1 Material
From Huntsman India Ltd., a polyester resin (maleic anhydride) with a molecular weight of 2400 g/mol, a viscosity of 600 cps, and a density of 1.13 g/cm3 was purchased. Merck India Ltd. produces methyl ethyl ketone peroxide (MEKP) under the brand name Butanox M-50. This catalyst has a density of 1.17 g/cm3, a molar mass of 210.1 g/mol, and a density of 0.95 g/cm3. It also has a molar mass of 401.2 g/mol and a density of 0.95 g/cm3. Cissus quadrangularis fiber was provided by Metro Composites Chennai, India. Fibers with a diameter of 230–270 μm and a length of 60–70 mm were used in this study (Fig. 1). This fiber has a density of about 0.7 g/cm3. It is explained in detail further how moringa gum powder particles are obtained using the ball milling process.
2.2 Moringa gum particle preparation
The gum was collected from buds and damaged sites of Moringa oleifera trees as shown Fig. 2a. This gum is shown in Fig. 2b. This gum was then added in distilled water and stirred for 6–8 h at room temperature as shown in Fig. 2c. This cleaned moringa gum was then dried in an oven for 2h to remove moisture content [14]. The dried gum stones were crushed to a fine form and dried off again in the oven for 1 h to remove the inbound moisture and be ready for ball mill as shown in Fig. 2d. The ball milling process was carried out in a planetary ball mill of brand RETSCH PM100 which is made in Germany according to the work reported by Arun et al. [15]. The powder to ball ratio maintained was 1:15 and the milling speed of 300 RPM was maintained throughout the process. The ball material used here was WC and the number of balls used is 10. The photographic view of ball milling process is illustrated in Fig. 2e whereas the outcome from the ball-milled moringa gum powder is shown in Fig. 2f and g as SEM particle morphology and particle size distribution density. The particle size ranged from 1 to 3 μm and the true density of particle is measured as 1.1 g/cm3.
2.3 Fabrication of composites
The hand layup procedure was used to make composite laminates in this investigation. First, the wax was liberally applied on the mold. The required amount of moringa gum powder with chopped Cissus quadrangularis fiber and curing catalyst was combined in a beaker with a significant amount of resin, and stirred using a sonicator for 20 min. After obtaining the homogeneous resin-moringa gum powder, the admixture was poured into a wax-coated rubber mold. By this method, thin 3-mm flat sheet plates were produced. A cotton roller was used to remove trapped air bubbles in the composite when doing the process, and the excess resin was wiped-off manually. The composites were cured at room temperature for 24 h outside the mold [16]. Figure 3a shows the steps followed for composite preparation and finally cured laminates of 3-mm thickness, while Fig. 3b represents the FTIR spectra which show the polyester-moringa gum particle interaction in the composite. A peak at 1736 cm−1 confirms the presences of C=O stretch, which is eliminated as acetic acid by the reaction between the acetoxy group in moringa and the hydroxyl group in polyester resin. Similarly, peaks of 2962, 1504, and 1292 cm−1 indicate the presences of O-H, C-H, and C-O bonds of eliminated acetic acid. Thus, the FTIR spectra confirm the production of acetic acid by the reaction of the acetyl group of moringa gum and resin. The various designations and compositions of composites are presented in Table 1.
2.4 Specimen preparation
The moringa gum powder–toughened chopped Cissus quadrangularis fiber–reinforced polyester composite was removed from the mold and cleaned. Prior to the specimen-making procedure, all composites were visually scrutinized for surface flaws and machined [17]. An abrasive water jet cutting machine (Maxiem water jets 1515, KENT, USA) was used to cut specimens of proper dimensions according to ASTM standards (mentioned in Section 3). The cutting of samples was done using the process variables such as garnet size of 80 mesh, an abrasive flow rate of 0.32 kg/min, and a maximum pressure of 225 MPa with a nozzle diameter of 1.1 mm.
3 Characterizations
The tensile and flexural properties of natural fiber particle composites were examined using a universal testing machine with a 20-ton loading capacity (FIE, India) with a crosshead speed of 2.5 mm/min, according to ASTM D638, ASTM D3039, and ASTM D790, respectively [18, 19]. The Young modulus was calculated as a ratio of stress vs. strain whereas the flexural modulus was measured using a formula of deflection of simply supported beams. Similarly, the hardness of composites was tested using a durometer (Shore-D) as per ASTM D2240 [20]. A mini-impact tester with a maximum load capacity of 20 J (Krystal Equipment Ltd. India) was used to test the impact behavior of composites according to ASTM D256 [21]. The drop weight impact test was performed in accordance with ASTM D 7136 [22], using a hemi circular-shaped impactor with a diameter of 2.5 cm, a mass of 5 kg, a velocity of 0.58 m/s, and an impact kinetic energy of 0.65 J as testing conditions. For each composite designation, five uniformly shaped specimens were evaluated, and average values were determined. Similarly, a field-emission CARL ZEISS Supra-55 scanning electron microscope was utilized to examine the surface morphology of composites. Before scanning, the broken surfaces of the samples were gold-sputtered. The prepared sample for this study is represented in Fig. 4.
4 Results and discussion
4.1 Mechanical properties
The mechanical properties such as tensile strength, flexural strength, impact toughness, and hardness are presented in Table 2. From the results shown, it is clearly seen that the composite designation PE shows a lower value for all tests because it is a pure matrix; there is lack of reinforcements. Pure matrix always shows brittle nature and also not able to transfer the load evenly [23]; hence, it gives values around 41 MPa, 0.73 GPa, 76 MPa, and 0.90 GPa for tensile strength, tensile modulus and flexural strength, flexural modulus. However, with the addition of Cissus quadrangularis fiber into the matrix, the increment in load bearing properties is observed for composite designation PE1. This increase in results is about 54% and 74% for tensile strength and modulus respectively. Similarly, the increase in values is also observed for flexural strength and flexural modulus, about 20% and 73% respectively. This increment in tensile and flexural properties is the reason of fiber addition, which improves the load bearing capacity of the composite material [24]. However, inclusion of moringa gum particle in natural fiber–reinforced composites increased the tensile and flexural properties for particle vol.% 0.5 and 1.0. The enhancement in values is due to the increase in bonding between the fiber and matrix by addition of particles as it contains hydroxyl groups to the side chain which are able to interact with polyester resin [25]. But further increment by 2 vol.% shows clustering effect in the matrix material which decreases the values for tensile and flexural properties [26]. Moreover, the Izod impact test shows lesser values for composite designation PE of 0.32 J as it is made up of pure polyester matrix, which possesses brittle nature. Further incorporation of Cissus quadrangularis fiber increased the impact resistances by 89% for composite designation PE1. Inclusion of fiber enhances the bonding and reinforces the load transfer ability of the matrix [27]. Moreover, the addition of moringa gum particle increases the impact resistances of composite by 90% and by 91% for particle vol.% 0.5 and 1.0. The improvements in results are due to the acetyl group of moringa gum particle reaction with resin, which enhances the adhesion and load transfer. However, increase in particle vol.% up to 2 decreased the impact strength. The reason behind this decrement is particle amalgamation, which reduces the interlocking mechanism of the matrix material. Similarly, microhardness for Cissus quadrangularis fiber– and moringa gum–reinforced polyester composites is shown in Table 2. The hardness values for composite designations PE and PE1 were shown as 76 and 78 Shore-D which is significant.
However, with further increment in particle volume up to 2 vol.%, the hardness value increased by 9% for composite designation PE4. The particle inclusion improved the interlocking mechanism of the matrix and reduces the voids, thus increased the hardness of the composite. Veeranna et al. [6] reported the mechanical properties of composites with Cissus quadrangularis natural fiber. It is noted that the present study provided near 8% of improvement in mechanical properties than the previous work reported. Moreover, Ganesh et al. [5] reported an ultimate tensile strength of 37.39 MPa, ultimate flexural strength of 63.53 MPa, and impact strength of 70.36 J/m for their composite made using hybrid form of ramie/kenaf fibers. In comparison with the present study, it is clear that the present investigation reported improved mechanical properties than the work reported by authors. Similarly, Ramasamy et al. [28] experimented on the use of different volume percentages of Cissus quadrangularis natural fiber constituted in epoxy matrix composite. The authors noted that the maximum observed tensile strength and modulus as well as flexural strength are about 21.97 MPa, 0.52 GPa, and 3.47 MPa. Finally, Siva et al. [29] investigated the surface-modified and untreated Cissus quadrangularis–reinforced polylactic composite. The treated reinforced composite (51.92 and 6.13 MPa) shows a 16.53% higher tensile strength than the untreated composite (44.56 and 7.46 MPa). The lower values for tensile and flexural properties are due to the different vol.% of reinforcement as well as lack of moringa gum particles in Cissus quadrangularis fiber composites.
4.2 Wear properties
The coefficient of friction for Cissus quadrangularis fiber– and moringa gum–reinforced polyester composites is illustrated in Fig. 5. The composite designation PE shows COF values of 0.82 due to the brittle nature of polyester resin and lack of reinforcements. Thus, the 3-body abrasion wear loss mechanism is getting increased, which eventually improved the wear loss in the material. However, with the addition of Cissus quadrangularis fiber, the wear resistance is increased to 0.74. The Cissus quadrangularis fiber in the matrix reduces the effective direct contact of pure polyester resin to abrasion disk, thus lowering the chances of getting wear of pure resin material and also reduces the heat during the abrasion process; thus, the erosion and adhesion wear loss is reduced [30]. Additionally, when moringa gum particle was added, the strong chemical bonds formed between acetyl groups of particle and dicarboxylic acid from the resin (Fig. 4). This reduced the COF of about 0.71, 0.62, and 0.60 for composite designations PE2, PE3, and PE4. The reason behind this is because of effective surface area of moringa gum particles, which could decrease the void content of matrix and as a result reduce the abrasion wear phenomenon (adhesion and erosion).
Similarly, the specific wear rate of Cissus quadrangularis fiber– and moringa gum–reinforced polyester composites shows improved resistance in Fig. 6. The pure polyester resin measures sp. wear rate of 0.028 mm3/Nm, whereas composite designation PE1 gives much improved wear resistance of 0.017 mm3/Nm. This is near 58% of improvement. Moreover, the incorporation of moringa gum particle shows the fine dispersion in the matrix material and enhanced bonding of reinforcements, which increases the wear resistances for composite designations PE2, PE3, and PE4 of about 0.014, 0.012, and 0.009 mm3/Nm respectively. This improved wear resistance is because of the presence of moringa gum particle in resin, which increases the cross-linking of molecules and reduces the direct contact of resin to abrasive wheel. Due to high surface area of particle were meets the abrasion disk instead of pure resin. This phenomenon improves the wear resistance by lowering specific wear rate. Jenish et al. [31] studied sustainable development of Cissus quadrangularis stem fiber/epoxy composite on abrasive wear rate. For its optimal input parameters, the experimental and proposed specific wear rates were 5.36 10–3 and 5.17 10–3 mm3/Nm, respectively. Madeva et al. [32] investigated tribological properties of Cissus quadrangularis stem fiber–reinforced isophthalic polyester composites. The specific wear rate gradually decreased when the applied load is increased. STR2 composite gives low specific wear rate of 1.6 × 10–14 mm3/Nm. Overall, the addition of Cissus quadrangularis fiber played a decent role in the composite.
4.3 Drop load impact behavior
Figure 7 shows drop impact energy absorption by various composite designations. The composite designation PE shows the lowest energy absorption due to the brittle nature of polyester resin. It shows about 0.32 J because of the pure matrix material in it. As further fibers were introduced, the load absorption capacity of the composites also increased drastically. The inclusion of Cissus quadrangularis fiber improves the load bearing capacity of composite designation PE1 by enhancing bonding between the matrix material and reinforcements [33]. However, further addition of moringa gum particles increased the drop load impact energy absorption for composite designations PE2 and PE3 but decreased in values for composite designation PE4. When drop load is impacted, the largest amount of energy is observed within specimens for 0.5 and 1.0 vol.% of moringa gum particle. The reason behind this outcome is the particles were evenly distributed and enhanced the interlocking mechanism of fiber matrix material which shows increment by 96% for composite designations PE2 and PE3 [34]. However, 2.0 vol.% particle creates clustering effect in composite designation PE4. Thus, the load absorbing capacity goes on decreasing by 6% as compare to composite designation PE3.
The time to plastic deformation of composites is shown in Fig. 8. For composite designation PE, the plastic deformation time is very less (2.8 μs). This is due to the brittle nature of polyester resin and lack of reinforcements in composite designation PE. Furthermore, by introducing Cissus quadrangularis fiber by 40 vol.%, the increment in time to plastic deformation up to 4.4 μs is observed. This is about 36% of improvement compared to the plain resin. The reason behind this outcome is the fiber reinforces with matrix and enhances the load bearing capacity of the composite [35]. However, when moringa gum particles were included by 0.5 and 1.0 vol.%, a drastic increment in results is seen but an increase in further vol.% leads to amalgamation of particle and shows decreed time to plastic deformation. This increment in time to plastic deformation is about 50% and 54% for composite designations PE2 and PE3, respectively, as compared to composite designation PE. But composite designation PE4 shows again decreased in deformation time due to the particle clustering effect, which reduced the bonding mechanism of the reinforcement and matrix material [36].
4.4 Fractography analysis
Figure 9 shows the SEM fractograph of various composites tested. Figure 9a shows the SEM image of composite designation PE which totally contains pure polyester resin. The pure matrix shows brittle fracture as shown. The more amount of microcrack inception and propagation of the same across the composite is the reason for this flat and brittle fracture [37]. Moreover, Fig. 9b illustrates the broken fiber surface; it shows strong bonding between the fiber and matrix material. This image is taken for composite designation PE1. This indicates the strong reacted phase of the fiber with resin matrix and reveals high correlation between them. This strong correlation between the fiber and matrix is the reason for the cellulose bonding and mechanical interlocking between the porous cellulosic contents to resin [38]. Similarly, Fig. 9c demonstrates the improved toughness of the matrix after the addition of fiber and moringa gum particles. The particles of 1.0 vol.% give such improved toughness by forming more cross-linking and suppressing the crack propagation in composite designation PE3. Thus, the fractograph shows more waviness and marginal pits and dimples. However, in Fig. 9d it is observed that the fracture occurred due to the presence of 2.0 vol.% of moringa gum particle’s amalgamation at specific points. The reason behind this agglomeration is due to the interfacial attraction between moringa gum and super saturation of it in the matrix phase [39].
5 Conclusions
The Cissus quadrangularis fiber–reinforced moringa gum powder–toughened polyester composites were fabricated in this study and characterized. The composites are made using hand layup process and cured. The specific conclusions arrived from the present study are as follows.
-
i.
The mechanical properties of the composite show the highest improvement in results for 1.0 vol.% of moringa gum particle of about 64% and 79% for tensile strength and modulus. Similarly, improvements of 39% and 80% were noted for flexural strength and modulus respectively. For the Izod impact test and hardness, the maximum values recorded were 3.75 J for PE3 and 83 Shore-D for PE4.
-
ii.
The lowest wear rate is observed for composite designation PE4, which contains 2.0 vol.% of moringa gum. And also, a lower coefficient of friction is observed for the same as 0.60.
-
iii.
The composite designation PE3 produced the highest impact absorption energy of 10.8J. Time to plastic deformation of composites shows an increment in time to plastic deformation of about 50% and 54% for composite designations PE2 and PE3.
-
iv.
SEM fractography shows the improved bonding of the fiber and matrix. The evidence of toughening improvement was also seen for the moringa gum particle–dispersed polyester composites.
-
v.
Hence, it is suggested that the addition of 1.0 vol.% of moringa gum gives improved load bearing and energy absorption properties. These mechanically toughened, impact load absorbing moringa gum powder–toughened Cissus quadrangularis fiber polyester composites could be used in various industrial applications such as automobile door and window panels, defense products, and sports goods as well as in domestic appliances making and home decoration structural slabs.
Data availability
All data in manuscript.
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N. Balaji: research, writing, and testing
S. V. Gurupranes: material arrangement and writing
S. Balaguru: testing support
P. Jayaraman: drafting
L. Natrayan: testing support
Ram Subbiah: testing support
S. Kaliappan: testing support
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Balaji, N., Gurupranes, S.V., Balaguru, S. et al. Mechanical, wear, and drop load impact behavior of Cissus quadrangularis fiber–reinforced moringa gum powder–toughened polyester composite. Biomass Conv. Bioref. 14, 19055–19064 (2024). https://doi.org/10.1007/s13399-023-04491-4
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DOI: https://doi.org/10.1007/s13399-023-04491-4