Static and Dynamic Mechanical Analysis of Coir Fiber/Montmorillonite Nanoclay-Filled Novolac/Epoxy Hybrid Nanocomposites
A simple method for the preparation of novel nanocomposites involving different weight ratios of blends of epoxy novolac (ENR) and diglycidyl ether of bisphenol A (DGEBA) resin, natural coir fiber, and organically modified montmorillonite (OMMT) nanoclay is described. It was found that on blending ENR with DGEBA, the storage modulus at room temperature are enhanced by about 100 % or more in the case of 50 and 65 % ENR-containing matrices; whereas, the enhancement in the case of 20 and 35 % ENR-containing matrices is only 50 % that of the pure matrix. It was also observed that the tan δ peak heights of the composite containing 50 and 65 % ENR are closer to that of 35 % ENR-containing composite. The plausible explanation is made on the basis of experimental findings of static and dynamic mechanical analysis (DMA) of ENR and DGEBA resin blends. X-ray diffraction (XRD) studies and Fourier transform infrared (FTIR) spectroscopy was used to obtain information on the modification of nanoclay and also thermal stability of various nanocomposites were determined from thermo gravimetric analyses. DMA showed that the modification of the clay strongly influences the stiffness and glass transition temperature (T g) of the nanocomposites. It is possible to manufacture coir composites with increased stiffness without sacrificing their ductility.
KeywordsCoir fibers Epoxy resin Composite materials Mechanical properties Fiber-matrix interaction Synergistic effect
I would like to thank Central Instrumental Facility (CIF) of Birla Institute of Technology, Mesra, Ranchi, India for providing equipment access.
- Blanchard V, Blanchet P (2011) Color stability for wood products during use: effects of inorganic nanoparticles. BioResour 6:1219–1229Google Scholar
- Chen HT, Gao J, Wang G, Shi SQ, Zhang SB, Cai LP (2004) Effect on temperature on calcium carbonate deposition in situ on bamboo fiber and polymer interfaces. Wood Fiber Sci 46:1–12Google Scholar
- Lee H, Neville K (1967) Handbook of Epoxy Resins. McGraw-Hill, New YorkGoogle Scholar
- Ma MG, Fu LH, Yao K, Tian CH (2014) Microwave-assisted synthesis and characterization of CaCO3 particles-filled wood powder nanocomposites. BioRes 9:3909–3918Google Scholar
- Singha AS, Thakur VK (2008a) Fabrication of hibiscus sabdariffa fiber reinforced polymer composites. Iran Polym J 17(7):782–791Google Scholar
- Singha AS, Thakur VK (2008b) Effect of fiber loading on urea formaldehyde matrix based green composites. Iran Polym J 17(11):861–873Google Scholar
- Singha AS, Thakur VK (2008c) Fabrication and study of lignocellulosic hibiscus sabdariffa fiber reinforced polymer composites. Bioresources 3:1173–1186Google Scholar
- Singha AS, Thakur VK (2010b) Synthesis and characterization of short Grewia optiva fiber based polymer composites. Polym Compos 31:459–470Google Scholar
- Singha AS, Thakur VK (2010c) Renewable resources based green polymer composites: analysis and characterization. 15:127–214Google Scholar