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 calorimetry. The crystallization was studied via calorimetric measurements at different cooling rates. Several additives were added to the base material. Some test samples were subjected to artificial ageing processes. A modified isoconversional method was used to describe the crystallization process under nonisothermal conditions. The value of the Avrami parameter was determined for primary and secondary crystallization.