STRUCTURAL CHARACTERIZATION OF COMMERCIAL IMPACT RESISTANT POLYPROPYLENE

摘要

Commercial impact resistant polypropylene copolymers (IPC) are produced by a sequential gas phase polymerization process. The final product is a complex blend of polypropylene (PP) and ethylene- propylene copolymer (EPC) of different ethylene contents. In the present work, the composition of two different impact copolymers was estimated performing a separation by Analytical Temperature Raising Elution Fractionation (TREF) using the step elution method. Recovered fractions were analyzed by DSC and SEC. The morphology of the whole material was examined by SEM. The differences in the disperse phase particle sizes are interpreted taking into acount the molecular weights of both EPC and PP, and the EPC content.