SIMULATIONS OF POLYMER CRYSTALLIZATION UNDER HIGH-PRESSURE

High pressure crystallization of polypropylene was studied by means of PVT measurements and computer simulations. The isothermal crystalliza tion behaviors were described by using a model which takes into accoun t the effect of pressure on the temperature dependence of nucleation r ate and linear growth rate. The agreement between the simulation and t he experiments was seen in the tendency that the crystallization was a ccelerated by the high pressure. The non-isothermal crystallization be havior was also simulated by applying a generalized Avrami equation. T he simulation curves well reproduced the experimental values below rel ative crystallinity 0.5 and below 100 MPa.