Influence of fiber hybridization on the dynamic mechanical properties of glass/ramie fiber-reinforced polyester composites

Abstract

This study aims to evaluate the influence of fiber hybridization and frequency on the dynamic mechanical properties of ramie/glass hybrid fiber-reinforced polyester composites. The storage modulus (E 0 ), loss modulus (E 00 ) and damping behavior (tan d) were evaluated as a function of different relative glass/ramie fiber volume ratios. For the storage modulus, the importance of the reinforcement effect above T g was revealed. Also, the peak height, peak width at half-height and relaxation area were investigated for the loss modulus and tan d curves, showing the influence of a shoulder below T g for each case. Finally, the tan d peak shifts to higher temperatures by increasing the frequency. Higher activation energy was observed for 75% glass fiber-containing composites.

Influence of Stacking Sequence on the Mechanical and Dynamic Mechanical Properties of Cotton/Glass Fiber Reinforced Polyester Composites

“…For the laminates, this reduction in modulus was less pronounced compared to the resin due to the effect of the reinforcement in the polymer matrix 19 . The coefficient of reinforcement effectiveness can be used to evaluate how effective the reinforcement is at maintaining the modulus as the temperature increases in comparison to the pure resin.…”

Effect of clay silylation on curing and mechanical and thermal properties of unsaturated polyester/montmorillonite nanocomposites

“…Figure 9 shows the variation in storage modulus of the polyester resin and the nanocomposites with temperature. In the glassy region (highlighted), modulus is determined by the strength of the intermolecular forces and also by the way in which the polymer chains are packed [16,28]. In this region, the neat resin showed the lowest modulus, followed by the C30B and C15A samples.…”

“…Indeed, the effect of nano reinforcement is still more pronounced on the modulus below T g than above it due to the increase in polymer chains movement and consequent decrease in the reinforcement effect of the clays, failing to prevent chains movement. To assess the effect of the nano reinforcement with increasing temperature, C coefficient was calculated ( Table 2) and the maximum effectiveness occurs for the maximum stress transfer between nanoclay and matrix (lower C values indicate better effectiveness) [28].…”

Enhancing the dispersion and adhesion of short aramid fibers in bromo‐isobutylene‐isoprene rubber using maleated polybutadiene resin via co‐vulcanization with 4, 4’ bis(maleimido)diphenylmethane

“…This is another supportive evidence for the enhanced adhesion of the resin‐treated fiber on to the BIIR matrix through the proposed crosslinking mechanism as shown in Scheme . From the Tan δ values of the unfilled matrix and the respective composites, the adhesion efficiency of the aramid fibers after the treatment of MA‐g‐PB was calculated based on the adhesion factor A as per the following equation . where, A is the adhesion factor, ϕ is the volume fraction and the subscripts f, c, and m denotes fiber, composite, and matrix, respectively. In general, a lower value of A indicates better fiber‐matrix interaction.…”