The isothermal crystallization of isotactic poly- propylenes (iPP) was investigated by polarization light microscopy (PLM). The crystal radius evolution and the transformed volume fraction were obtained by PLM experiments. In this paper, a general differential system for 2D quiescent conditions was adopted to describe the crystalline morphology evolution of iPP. Matlab was used for the simulation of the crystallinity and crystal size evolution. There was good agreement between the experimental and simulation results of the transformed volume fraction and the radii of crystals for the 2D condition.
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