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以4,4’-(六氟异丙烯)二酞酸酐(6FDA)与4,4’-双(4-氨基苯氧基)二苯砜(BAPS)为反应单体,以N-甲基-2-吡咯烷酮(NMP)为溶剂,合成了聚酰胺酸(PAA),将PAA溶液采用流延成膜的方法制备成薄膜;另外,将PAA溶液采用干-湿法纺丝工艺制得PAA中空纤维膜,再将PAA薄膜及其中空纤维膜在300℃左右的高温热环化制得6FDA-BAPS型聚酰亚胺(PI)膜。研究了6FDABAPS型PI及其中空纤维膜的结构与性能。结果表明:所合成的6FDA-BAPS型PI为目标产物,其在NNP、N,N-二甲基乙酰胺、四氢呋喃中具有良好的溶解性能。6FDABAPS型PI中空纤维膜外皮层致密、支撑层疏松多孔,该中空纤维膜具有较高的热学性能和力学性能,在氮气氛围中热失重5%的温度为511℃,断裂强度为26.5 MPa。
Using 4,4 ’- (hexafluoroisopropene) phthalic anhydride (6FDA) and 4,4’-bis (4-aminophenoxy) diphenyl sulfone (BAPS) Polyamic acid (PAA) was synthesized by using 2-pyrrolidone (NMP) as a solvent and PAA solution was cast into a film. In addition, PAA hollow fiber was prepared by dry-wet spinning process Film, and then the PAA film and its hollow fiber membrane thermal cyclization at about 300 ℃ to obtain 6FDA-BAPS-type polyimide (PI) film. The structure and properties of 6FDABAPS-type PI and its hollow fiber membranes were studied. The results showed that the synthesized 6FDA-BAPS PI was the target product with good solubility in NNP, N, N-dimethylacetamide and tetrahydrofuran. The hollow outer membrane of 6FDABAPS type PI hollow fiber membrane is dense and its support layer is porous. The hollow fiber membrane has high thermal and mechanical properties. Under nitrogen atmosphere, the temperature of 5% weight loss is 511 ℃ and the breaking strength is 26.5 MPa.