Crystallization kinetics of polypropylene-polyethylene-based copolymers

A crystallization kinetics analysis of several polypropylene-polyethylene ( PP-PE), PP-rich copolymers was made by means of differential scanning calor imetry. The crystallization was studied via calorimetric measurements at di fferent cooling rates. Several additives were added to the base material. S ome test samples were subjected to artificial ageing processes. A modified isoconversional method was used to describe the crystallization process und er nonisothermal conditions. The value of the Avrami parameter was determin ed for primary and secondary crystallization.