2-STAGE CRYSTALLIZATION KINETICS MODELING OF A MISCIBLE BLEND SYSTEM CONTAINING CRYSTALLIZABLE POLY(BUTYLENETEREPHTHALATE)

A modified two-stage kinetic model is proposed to describe the crystal lization/solidification from the melt state of a miscible binary blend system comprising amorphous poly(ether imide) (PEI) and crystallizabl e poly(butylene terephthalate) (PBT). Differential scanning calorimetr y (DSC) was employed to monitor the isothermal melt-crystallization of the PBT/PEI blends. A nonlinear regression method was adopted for est imating the kinetic parameters in accordance with the modified two-sta ge series-parallel model in comparison with the Avrami model. The resu lts suggested that the crystallization of the PEI/PBT blends could be more precisely described by using the modified model, which properly t akes into account the changing mechanisms from early to later stage of crystallization. For practical applications, an optimal temperature w indow for solidifying PEI/PBT miscible blends may be determined by uti lizing this model.