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.

原位缩聚合成含聚芳酰胺/酯的分子复合材料 Ⅰ 分子复合材料的研究进展

高分子复合材料是指两种或两种以上物理和化学性质不同的高分子所组成的多相固体材料,是能够将各组分的优点有机结合起来,并表现某些新的有用特性的材料体系。近年来有关刚性棒状高分子与柔性基体聚合物的复合与研究非常活跃,但是,由于刚性棒状高分子与柔性基体存在着在热力学上的不相容性,使两组分达到分子水平的分散相当困难;而且由于刚性棒状高分子难溶难熔,因此更难于用溶液共混或螺杆挤出共混的方法制备分子复合材料。因此改进刚性高分子与柔性链聚合物基体的混溶性是多相高分子体系的一个重要课题。文章综述并讨论了分子复合材料的研究进展以及各种合成技术。