Unusual Spherulitic Morphology of Poly(propylene fumarate)  

作　　者：Xiao-Yu Meng Yi Li Shu-Fang Yao Xue-Wei Wei Hai-Mu Ye 

机构地区：[1]Department of Materials Science and Engineering,College of New Energy and Materials,China University of Petroleum,Beijing 102249,China

出　　处：《Chinese Journal of Polymer Science》2021年第4期493-500,I0007,共9页高分子科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21674128);Science Foundation of China University of Petroleum,Beijing(No.ZX20200097).

摘　　要：Spherulites are the most common crystalline morphology and thus the visual expression of crystal structures for polymers.The diversified patterns have provided intuitive morphology probes for various crystallization behaviors,while the correlations between them are still needed to be enriched.In this work,the complicated spherulitic morphology of poly(propylene fumarate)(PPF),which is sensitive to crystallization temperature,is investigated.PPF melt,respectively,crystallizes into rough spherulites,regularly banded spherulites,and spherulites containing both two kinds of morphology at low,high,and mediate temperatures.By systematically assaying,it is clear that the growth axis along the radial direction changes from a-axis to b-axis as the crystallization temperature increases,which leads to the formation of unique crystallization-temperature-dependent spherulites.Based on detailed characterization of Fourier transform infrared spectroscopy,the packing state of the specific hydrogen bonds of"C=C-H…O=C-C=C"in PPF crystal lattices is determined,and furthermore,the mechanism for temperature-dependent selection of growth axes for PPF spherulites in melt is reasonably speculated.

关 键 词：SPHERULITE CRYSTALLIZATION Growth axis Hydrogen bond 

分 类 号：TQ317[化学工程—高聚物工业]