Crystalline structure and reinforcement in hybrid PP composites

Abstract Hybrid composites were prepared from a PP homopolymer, talc and PVA fibers by twin-screw extrusion injection molding. Talc was added to improve stiffness, while the serve increase impact resistance. Mechanical properties characterized tensile testing, structure studied SEM optical microscopy. The results showed that has strong nucleating effect in used spite of fact grade contained agent inherently. also nucleated slightly, with trans-crystallization occurring around fibers. two components independent each other on lamella thickness, but crystallinity decreased increasing content hybrid composites. clearly crystalline changes considerably upon addition components, both thickness increasing. However, somewhat contradictorily, these mechanical is small. Model calculations have shown stiffness increases about 0.5 GPa due nucleation, moduli as large 7 are reached talc. Impact resistance completely or crystallinity; this property determined mainly local deformation processes initiated Dispersed direct additive determine studied, role secondary importance.