Studies on Dynamic Mechanical Analysis and Phase Morphology of Glass/Bamboo Fibers Reinforced Vinyl ester Resin Based Hybrid Composites

摘要

In this article, studies on dynamical mechanical analysis to determine the dynamic properties of hybrid composites as a function of temperature and frequency along with phase morphology are reported. Hybrid composites were based on vinyl ester (VE) resin fabricated with glass and bamboo fibers. 25, 50 and 75 wt% of glass fibers were replaced by bamboo fibers of the optimized glass fiber reinforced composites(containing 50 wt% glass fibers and 50 wt% resin) and were subjected to dynamical mechanical analysis. The storage modulus E' was found to decrease with the increase of weight fraction of bamboo fibers. Loss modulus was also found to decrease with the bamboo fiber loading while the damping property was found to decrease marginally. Scanning electron micrographs of flexural fracture surfaces of composites demonstrated good fiber-matrix bonding for BH0 & BH1 and debonding for BH3 & BH-4. Kubat parameter was calculated to study the adhesion between matrix and fibers of the fabricated composites. The Kubat parameter (K-p) of BH1 is very close to BH0 whereas the K-p value of BH2 and BH3 is higher than that of BH0 and BH1. It indicates that the interfacial adhesion decreased marginally for BH1 and the same decreased significantly for BH2 and BH3. Cole-Cole analysis was made to understand the phase behaviour of the composite samples. An imperfect semicircle obtained from Cole-Cole plots showing the heterogeneity of the system and the good interfacial adhesion at 25wt% glass fiber replacement by bamboo fibers.