Crystallization mechanism of polymer

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We have studied formation mechanism of polymer crystallization, focusing our attention on induction period of crystallization before nucleation. This work can be classified into the following four subjects.(1)Structural formation in preparatory process of polymer crystallization : We have directly observed transformation process from molten state to mesomorphic state of isotactic polypropylene(iPP) using super temperature jump apparatus developed by our laboratory.(2)Polymer crystallization under shear flow : We have evaluated structure formation process of so-called shishi-kebab structure in crystallization of iPP under shear flow, using time resolved depolarized light scattering, small angel X-ray scattering, small angel neutron scattering and wide angel neutron scattering techniques.(3)Crystallization mechanism of polymers from oriented glass : In order clarify the mechanism of formation of so-called long period, we have studied crystallization process of oriented poly (ethylene terephthalate) using a time resolved wide angel scattering technique(4)We investigated effects of phase separation on polymer crystallization in mixture of rod-like polymers and flexible polymers and clarified depletion effects in polymer crystallization.