长软链段对苯二甲酸乙二酯-环氧乙烷多嵌段共聚物的组成不均一性研究

合成了不同软链段长度和不同硬链段含量的系列对苯二甲酸乙二酯－环氧乙烷(PET-PEO)多嵌段共聚物,用NMR质子港测定了硬链段含量,对部分溶于氯仿的PET－PEO多嵌段共聚物进行了分离,并分别测定其氯仿可溶物和不溶物的硬链段含量、熔融热谱和热结晶谱.揭示了PET－PEO多嵌段共聚物的组成不均一性及其对软镇段长度和硬链段含量的依赖性,进而用DSC热谱证明了软链段和硬链段的结晶能力与PET－PEO多嵌段共聚物组成不均一性密切相关.

Compositional Heterogeneity of Ethylene Terephthalate-Ethylene Oxide Segmented Copolymer with Long Soft Segment

The series of ethylene terephthalate-ethylene oxide segmented copolymers withdifferent long soft segments and different hard segment contents have been synthesized. Thehard segment contents are measured by 1H NMR.Four PET-PEO segmented copolymerswere separated into soluble and insoluble parts in chloroform.The results have revealed avery evident compositional heterogeneity in these four samples,which depends on the molec-ular weight of soft segment and hard segment content. Simultaneously the melting and ther-mal spectra of the four PET-PEO segmented copolymers were obtained by DSC. The solubleand insoluble parts have shown the quite different crystallizability both for soft and hard seg-ments, which has the good correspondence with the compositional heterogeneity.