【摘要】 本工作介绍了可以提高聚酰胺酸贮存稳定性的三种方法:1.脱溶剂:残留26％DMAC的薄膜在密封保存315天之后仍具有良好的性能;2.加入叔胺:可提高聚酰胺酸溶液的粘度,但对于三乙胺,有时易发生凝胶化;3.采用对水解稳定的二酐:由三苯二醚四酸二酐和二苯醚二胺获得的聚酰胺酸的DMAC溶液在室温放置385天后仍能涂制成良好的薄膜。更多还原

【Abstract】 Three methods, which can increase the stability of polyamic acid in storage,were reported. 1 ) Partly removing of solvent from polyamic acid: the film, in which 26% of DMAC maintained, still have good properties after 315 days’ storage in sealed tube. 2 ) Addition of tertiary amines can raise the viscosity of polyamic acid in solution, but triethylamine sometimes caused gelation. 3 ) Using dianhydride which is more stable for hydrolysis: the polyamic acid from 4 , 4 -bis ( 3 ’ , 4 ’ - dicarboxyphenoxy) benzene dianhydride and 4,4’-diaminophenyl ether in DMAC can be used to make excellent film after 385 days’ storage at room temperature.更多还原