Abstract
Abstract Polypropylene (PP) -used discontinuous carbon fiber reinforced thermoplastic (CFRTP) often exhibits insufficient mechanical properties because PP is known to show poor adhesion to carbon fibers. Additionally, a Vf limitation of discontinuous CFRTP also decrease the composite strength. In this study, the relationship among adhesion, Vf and mechanical properties in newly developed PP-used CFRTP sheet were evaluated. Interfacial Shear Strength (IFSS) between CF and PP can be quantitatively controlled by changing the modified PP content in matrix resin. Higher IFSS saturated with bending strength that indicates IFSS was no longer dominant the failure mode. The bending strength was also saturated in higher Vf. It is probably due to increasing the points of intersection in the dense CF network that reduces the utilization of strength in carbon fiber.
