异核双金属协同催化环氧环己烷与邻苯二甲酸酐无规共聚

设计、合成了一种新型异核双金属配合物,用于催化环氧环己烷(CHO)和邻苯二甲酸酐(PA)的共聚反应,以制备聚(醚-酯)材料.分别通过核磁共振波谱和电喷雾质谱对聚合物及其水解后产物结构进行分析,证明所得共聚物为醚酯单元呈无规分布的聚(醚-酯).重点考察了配体结构、金属离子、反应温度和催化剂浓度对聚合反应的影响.最后,对所得聚(醚-酯)无规共聚物热性能进行研究,表明聚醚链段的引入可以调变其玻璃化转变温度,丰富了此类聚酯材料的应用场景.

Pyrolysis-Gas Chromatography/Mass Spectrometry for Microstructure and Pyrolysis Pathway of Polyester-Polyether Multiblock Copolymer

The composition and sequence distribution of monomeric units in polyester polyether multiblock copolymer were studied by pyrolysis? gas chromatography (PGC) and pyrolysis gas chromatography/mass spectrometry (PGC/MS). PGC was applied to study the F t curve of the multiblock copolymer and PGC/MS was used to separate and identify the pyrolyzates. DTA experiment was used to study the decomposition temperature. The results show that the beginning point of elastomer’s decomposition was about 300?℃ and the decomposition temperature of most of the sample was 550?℃. Many pyrolyzates were produced because of the breaking of weak bonds in the sample. The possible microstructure was verified and the pyrolysis pathway of the copolymer was investigated.