Non-isothermal crystallization kinetics and its effect on the mechanical properties of homopolymer isotactic polypropylene

The non-isothermal crystallization of the isotactic Polypropylene (iPP) was studied using differential scanning calorimetry and polarizing optical microscopy. Jeziorny’s model Ozawa’s theoretical approaches were applied to study kinetics iPP. approach proved be most relevant present material. Simultaneously, activation energy calculated with Kissinger’s method Vyazovkin’s iso-conversional approach. Indeed, latter provides an varying between 100 176 kJ/mol. Furthermore, WAXD scans indicated presence a single crystalline form in used To effect microstructure on mechanical properties iPP, multiscale tensile tests carried out for different film microstructures. At macroscopic scale, increase diameter spherulites, inevitably accompanied by rise crystallinity rate, induces growth rigidity, brittleness, elastic limit. Moreover, results in-situ micro-tensile evolution spherulites during loading.