ORIENTATED CRYSTALLIZATION IN DISCONTINUOUS ARAMID FIBER/ISOTACTIC POLYPROPYLENE COMPOSITES UNDER SHEAR FLOW CONDITIONS

摘要

The crystallization behavior of thermoplastic polymers is strongly affected by processing conditions. The subject of flow-induced crystallization in polymer melts is extremely important in polymer processing. This is because the final properties of polymers are the direct consequence of the crystalline morphology, where the final morphology is often dictated by the early structure formation under flow. Furthermore, flow is known to significantly enhance the kinetics of crystallization and to produce highly oriented morphologies.