以1,4,5,8-萘四甲酸二酐(NTDA)、4,4′-双(3-氨基苯氧基)二苯基砜(mBAPS)与3,7-二氨基-2,8-二甲基二苯并噻唑砜(DDBT)为单体,采用传统一步法合成了一种主链含有砜基结构的聚酰亚胺NTDA-mBAPS/DDBT,并通过红外光谱对其结构进行表征。使用1-甲基-2-吡咯烷酮(NMP)作为溶剂,通过浇铸得到了聚酰亚胺膜(PI膜),并测试了膜的各项性能。机械性能测试结果表明,制得的PI膜具有良好的机械性能,拉伸强度为68M～81MPa,断裂伸长率为12.9%～28.7%;气体分离性能测试结果显示,PI膜具有较高的气体选择性能,NTDA-mBAPS/DDBT 1/1:PCO2/PN2=30.5,PCO2/PCH4=37.7;NTDA-mBAPS/DDBT 3/1:PCO2/PN2=33.1,PCO2/PCH4=45.4。
A polyimide(PI) was synthesized from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA),4,4′-bis (3-aminophenoxy) diphenyl sulfone (mBAPS) and 3,7-diamino-2,8-dimethyldibenzothiazole sulfone (DDBT) via the traditional one-step reaction.The polyimide was characterized by FT-IR spectrum.Mechanical test results revealed that the prepared polyimide membranes had good mechanical properties with tensile strength of 68～81MPa and the elongation at break of 12.9% to 28.7%.Gas separation test displayed that the PI membranes possessed excellent separation performances for CO2/N2 and CO2/CH4,NTDA-mBAPS/DDBT 1/1:PCO2/PN2=30.5,PCO2/PCH4=37.7;NTDA-mBAPS/DDBT 3/1:PCO2/PN2=33.1,PCO2/PCH4=45.4.
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基金资助
国家“973”计划项目(2014CB643600)
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