Dynamic mechanical analysis and morphological studies of glass/bamboo fiber reinforced unsaturated polyester resin‐based hybrid composites

Hybrid composites based on isophthalate polyester and vinyl ester resin were 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 and were subjected to dynamical mechanical analysis to determine the dynamic properties as a function of temperature and frequency. 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 loading while the damping property was found to increase marginally. Scanning electron micrographs of flexural fracture surfaces of composites demonstrated fiber‐matrix bonding. Cole–Cole analysis was made to understand the phase behavior of the composite samples. Kubat parameter was calculated to study the adhesion between matrix and fibers of the fabricated composites.