Novel epoxy-based glass fiber reinforced composites containing compatibilized para-aramid fibers and silanized nanoclay for improved impact strength

This research developed epoxy-based glass fiber reinforced composite (GFRPs) containing multi-scale fiber reinforcement comprising of silanized nanoclay (nano-reinforcement) and compatibilized para-aramid (PA) fibers (micro-reinforcement) for enhanced impact strength and tensile-flexural properties. VARIM technique was used for fabrication of GFRPs. Surface modification (silanization) of nanoclay was confirmed by FTIR and that of PA fibers was confirmed by SEM-EDS and FTIR. Dispersion/morphology of nanoclay in the processed nanocomposites was determined by XRD and TEM analysis. Three different methods were used for the compatibilization of PA fibers. All methods exhibited a substantial increase in impact strength without a decrease in flexural/tensile strength. Nanocomposite containing 1.0 phr MAH treated PA fibers and 2 phr silanized nanoclay showed the highest improvement in impact strength (34% higher than the reference composite) along with minor improvements in tensile strength (6%), and flexural modulus (13%). SEM micrographs of the fractured surface of impact test samples were used to identify the mechanisms/reasons for the improved mechanical performance of the newly developed GFRPs.

Automated summary

This research developed a novel epoxy-based glass fiber reinforced composite with enhanced impact strength and tensile-flexural properties. Through surface modification and compatibilization, nanoclay and PA fibers effectively reinforced the composite materials.