TAILORING OF MULTI-COMPONENT CRYSTALLINE SYSTEMS IN ISOTACTIC POLYPROPYLENE

摘要

A novel method for the preparation of unique 3-phase crystalline systems in isotactic polypropylene (iPP) has been proved. It is based on a synergy application of a specific β-nucleating agent and high pressure during crystallization. The γ phase formation is supported by elevated pressure and high temperature during iPP crystallization; in this case, the growth of both β and α phase was significantly suppressed. Nevertheless, in the course of crystallization at lower pressure and/or lower temperatures, strong β-nucleation efficiency of NU100 favored the formation of β phase.