摘要
通过合成四羧酸丁烷型脂肪族和四羧酸环五烷型脂环族聚酰亚胺，以拓展现有的只限于芳香型聚酰亚胺膜材料的范围，并测定和比较了芳香型聚酞亚胺、四羧酸丁烷型脂肪族和四羧酸环五烷型脂环族聚酰亚胺的热学性能，初步探讨了结构与热性能之间的关系。
Two new polyimides with aliphatic radical were synthesized. The aims are to breakthrough the limit which aromatic polyimide is primarily material as gas separation membrane inpolydride memrane materical, and to look for gas separation membrane materials with goodpermeability and selecivity. Tg, TGA and DSC of prepared polyimide membranes were determined. Studied the relationship between the structure and thermal properties of polyimides. Fromthe results, it can be seen that the thermal properties of polyimides are related to their molecular structure, and all polyimides studied in here have good thermal properties.But the thermalproperties of two novel polyimides with aliphatic radical are less than that of aromaticpolyimide. There is a rank of glass transition temperature of the polyimides prepared by identical diamine with different dianhydrides as : PMDA > CPDA > BTDA > BDA. The rank ofglass transition temperature of the polyimides prepared by identical dianhydride with differntdiawines as : PMDA-Bz > PMDA-DDA>PMDA-MDA> PMDA-ODS; BTDA-TMPDA>BTDA - Bz > BTDA-DDS> BTDA - MDA > BTDA - ODA; BDA - TMPDA > BDA - Bz>BDA-DDS >BDA-MDA >BDA-ODA; CPDA-TMPDA >CPDA-Bz >CPDA-DDS>CPDA-MDA>CPDA-ODA. The deremposition temperature (Td) and meting temperature(Tm) wer also determined. The rank of deremposition tempefature (Td) as : PMDA>CPDA>BPDA>BDA>BTDA, the tank of meting temperature (Td) as : PMDA>CPDA>BTDA>BPDA>BDA.
