聚乙二醇(PEG)/聚乙烯醇(PVA)固－固相变材料受限非等温结晶动力学研究

New serials of PVA-g-PEG graft copolymers with the characterization of solid-solid phase change were prepared. The confined of PEG in PVA-g-PEG graft copolymers was investigated by differential scanning calorimetry. The crystallization kinetics was discussed by several methods. The results showed that the lower temperature peak (T(subscript p)) shifted to the lower temperature and its peak intensity also decreased with increasing the cooling rates, t(subscript 1/2) decreased and G increased. The T(subscript p) of graft copolymers were lower than pure PEG and t(subscript 1/2) of which were higher than pure PEG. The graft ratio had litter influence on t(subscript 1/2). Avrami parameters were all in 2- 3. The results also showed that both Jeziorny method and the new method combing the Avrami equation and Ozawa equation by Mo et al. described this system very well.