Abstract
The polyamide-based thermoplastic elastomers (Pebax®) were melt compounded with multi-walled carbon nanotubes (MWNTs: 0.25∼5 wt%) and the variation of rheological and physical properties with MWNT contents was investigated. The crystallization temperature (Tc) of the nanocomposites with 0.5 wt% MWNTs was most increased by ca. 8oC, but it was decreased by further addition. In addition, the presence of MWNTs broadened the Tc peak with increasing nanotube contents. In contrast, the melting behavior was little influenced by the presence of MWNTs for all compositions. The incorporation of MWNTs increased the complex viscosity with MWNT contents and the abrupt increase was observed from 1 wt%. In addition, lower Newtonian flow region became disappearing with increasing MWNT contents, exhibiting notable shear thinning behavior from 1 wt% loading. Storage modulus was increased with MWNT contents in a similar manner to viscosity. Casson plot demonstrated a non-zero positive intercept for all the samples. In particular, the abrupt increase of yield stress was observed from 1 wt% loading. In the Cole-Cole plot, the nanocomposites gave a deviated curve from pure Pebax and the slope was decreased with increasing MWNT contents. The relaxation time calculated from viscoelastic parameters was increased with nanotube contents, but the increasing extents were reduced with increasing frequency. From 2 wt% MWNTs, the electrical conductivity was observed, indicating that the electrical percolation existed between 1.5 and 2 wt%. At 0.25 wt% loading the tensile strength was slightly increased, but it was gradually decreased by further addition. The introduction of MWNTs increased the tensile modulus with nanotube contents. In addition, ductile properties were reduced with increasing MWNT contents, resulting in low toughness.
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References
Ajayan, P.M., O. Stephan, C. Colliex, and D. Trauth, 1994, Aligned carbon nanotube arrays formed by cutting a polymer resin-nanotube composite, Science 265, 1212–1214.
Bondar, V.I., B.D. Freeman, and I. Pinnau, 1999, Gas sorption and characterization of poly(ether-b-amide) segmented block copolymer, J. Polym. Sci. Part B: Polym. Phys. 37, 2463–2475.
Chae, D.W. and B.C. Kim, 2005, Physical properties of isotactic poly(propylene)/silver nanocomposites: Dynamic crystallization behavior and resultant morphology, Macromol. Mater. Eng. 290, 1149–1156.
Chae, D.W., J.H. Lim, J.S. Seo, and B.C. Kim, 2012, Variation of physical properties of nylon-66/clay nanocomposites with preparation conditions, Korea-Aust. Rheol. J. 24, 45–52.
Chae, D.W., K.J. Kim, and B.C. Kim, 2006, Effects of silicalite-1 nanoparticles on rheological and physical properties of HDPE, Polymer 47, 3609–3615.
Chae, D.W., K.H. Lee, and B.C. Kim, 2006, Rheological properties of ferrite nanocomposites based on nylon-66, J. Polym. Sci. Part B: Polym. Phys. 44, 371–377.
Deleens, G., 1981, A new generation of thermoplastic elastomers the polyether block amide (PEBA), Presented at 39th Ann. Tech. Conf. of SPE, Boston, May 4–7.
Flesher, J.R., 1986, Pebax polyether block amide — a new family of engineering thermoplastic elastomers, Abstracts of Papers of the American Chemical Society 191, 64.
Grossiord, N., H.E. Miltner, J. Loos, J. Meuldijk, B.V. Mele, and C.E. Koning, 2007, On the crucial role of wetting in the preparation of conductive polystyrene-carbon nanotube composites, Chem. Mater. 19, 3787–3792.
Hwang, T.Y., S.M. Lee, Y.J. Ahn, and J.W. Lee, 2008, Development of polypropylene-clay nanocomposite with supercritical CO2 assisted twin screw extrusion, Korea-Aust. Rheol. J. 20, 235–243.
Hyun, K., H.T. Lim, and K.H. Ahn, 2012, Nonlinear response of polypropylene (PP)/Clay nanocomposites under dynamic oscillatory shear flow, Korea-Aust. Rheol. J. 24, 113–120.
Iijima, S., 1991, Helical microtubules of graphitic carbon, Nature 354, 56–58.
Iyer, S., A. Detwiler, S. Patel, and D.A. Schiraldi, 2006, Control of coefficient of thermal expansion in elastomers using boron nitride, J. Appl. Polym. Sci. 102, 5153–5161.
Kang, M.H. and S.J. Lee, 2012, Rheological and electrical properties of polystyrene/multi-walled carbon nanotube nanocomposites prepared by latex technology, Korea-Aust. Rheol. J. 24, 97–103.
Kim, B.C. and S.J. Lee, 2008, Silicate dispersion and rheological properties of high impact polystyrene/organoclay nanocomposites via in situ polymerization, Korea-Aust. Rheol. J. 20, 227–233.
Kim, J.H. and Y.M. Lee, 2001, Gas permeation properties of poly(amide-6-b-ethylene oxide)-silica hybrid membranes, J. Memebrane. Sci. 193, 209–225.
Liu, L., Z. Qi, and X. Zhu, 1999, Studies on nylon 6/clay nanocomposites by melt-intercalation process, J. Appl. Polym. Sci. 71, 1133–1138.
Lyons, J.G., J.E. Kennedy, S. Lordan, L.M. Geever, and C.L. Higginbotham, 2010, Characterisation of the effects of a titanium micro particle filler on a polyether-block-amide host matrix, J. Mater. Sci. 45, 3204–3214.
Manchado, M.A.L., L. Valentini, J. Biagiotti, and J.M. Kenny, Thermal and mechanical properties of single-walled carbon nanotubes-polypropylene composites prepared by melt processing, Carbon 43, 1499–1505.
Markarian, J., 2008, Thermoplastic elastomer compounds continue upward trend, Plast. Addit. Compound. 10, 38–40, 42–43.
Moniruzzaman, M. and K.I. Winey, 2006, Polymer nanocomposites containing carbon nanotubes, Macromolecules 39, 5194–5205.
Murali, R.S., S. Sridhar, T. Sankarshana, and Y.V.L. Ravikumar, 2010, Gas permeation behavior of Pebax-1657 nanocomposite membrane incorporated with multiwalled carbon nanotubes, Ind. Eng. Chem. Res. 49, 6530–6538.
Oh, J.S., K.H. Ahn, and J.S. Hong, 2010, Dispersion of entangled carbon nanotube by melt extrusion, Korea-Aust. Rheol. J. 22, 89–94.
Rader, C.P. and R.F. Stockel, 1995, Polymer recycling: an overview, Plastics, Rubber, and Paper Recycling, ACS Symposium Series 609, 2–10.
Spontak, R.J. and N.P. Patel, 2000, Thermoplastic elastomers: fundamentals and applications, Curr Opin. Colloid. In. 5, 333–340.
Woo, D.K., B.C. Kim, and S.J. Lee, 2009, Preparation and rheological behavior of polystyrene/multi-walled carbon nanotube composites by latex technology, Korea-Aust. Rheol. J. 21, 185–191.
Yang, I.K. and P.H. Tsai, 2006, Intercalation and viscoelasticity of poly (ether-block-amide) copolymer/montmorillonite nanocomposites: Effect of surfactant, Polymer 47, 5131–5140.
Yen, H.W., Z.H. Chen, and I.K. Yang, 2012, Use of the composite membrane of poly(ether-block-amide) and carbon nanotubes (CNTs) in a pervaporation system incorporated with fermentation for butanol production by Clostridium acetobutylicum, Bioresource. Technol. 109, 105–109.
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Bae, WS., Kwon, O.J., Kim, B.C. et al. Effects of multi-walled carbon nanotubes on rheological and physical properties of polyamide-based thermoplastic elastomers. Korea-Aust. Rheol. J. 24, 221–227 (2012). https://doi.org/10.1007/s13367-012-0027-9
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DOI: https://doi.org/10.1007/s13367-012-0027-9