Polymer crystallization via non-equilibrium intermediate state and control of higher order structure

点击翻译按钮获取中文摘要

We have studied structure and structure formation mechanism of non-equilibrium intermediate states of polymers during the crystallization process using small-and wide-angle X-ray scattering, small-and wide-angle neutron scattering and light scattering. It was found in the study on polyamide that the structure formation during the incubation period before crystallization was closely related to the melt memory effects. We also investigated structure of intermediate state(or precursor) of shish-kebab during the shear-induced crystallization using micro-beam small-and wide-angle X-ray scattering to find there exist crystallites. In addition we revealed that the role of molecular weight in the shish-kebab formation using small-angle X-ray and neutron scattering. In the study of mesomorphic phase of isotactic polypropylene we found the best heating rate to obtain a giant single crystals. These findings surely provide many new insights on the crystallization mechanism via the non-equilibrium intermediate states and show new ways how to control the higher order structure of polymers.