CRYSTALLIZATION OF POLYPROPYLENE .2. NONISOTHERMAL KINETICS

With the aid of a differential scanning calorimeter (DSC), the non-iso thermal crystallization kinetics of polypropylene was investigated on the basis of the Avrami equation, Turnbull-Fisher nucleation theory an d Hoffman-Lauritzen growth theory. According to the non-isothermal cry stallization kinetics derived from the isothermal cases, it is reveale d that the ultimate crystallinity and the average ultimate spherulite size increase to finite values as the cooling rate decreases, while th e average ultimate spherulite number varies in the opposite sense.