膜科学与技术

基于2,2＇-双取代BPDA基聚酰亚胺气体分离膜的性能研究

作者：杨萌萌，张梦茹，陈爱民

单位： 1.浙江工业大学,化学工程学院，杭州 3100141； 2.中国科学院宁波材料技术与工程研究所,高分子与复合材料实验室，宁波 315201

关键词： 2,2'-双取代联苯二酐；大体积侧基；聚酰亚胺；气体分离性能

出版年,卷(期):页码： 2023,43(2):59-67

摘要：

?本文以3,3',4,4'-联苯四甲酸二酐（BPDA）为原料制备了三种具有不同大小侧基的二酐，即2,2'-二苯基-4,4',5,5'-联苯四羧酸苯酐（PBPDA）、2,2'-双（2''-三氟甲基苯基）-4,4',5,5'-联苯四羧酸二酐（O6FPBPDA）、3,3''',5,5'''-四三氟甲基-[1,1':2',1'':2'',1'''-四苯基]-4,4',5,5'-四甲酸二酐（12FPBPDA）。三种二酐与刚性扭曲的二胺，即2,6-二氨基三蝶烯（DAT）和3,9-二氨基-4,10-二甲基-6H,12H-5,11-亚甲基二苯并[b,f][1,5]二氮芳辛（TBDA2），通过一步法聚合制备了一系列自聚微孔聚酰亚胺（PIM-PI），并通过核磁、红外测试表征了聚合物结构。所得聚合物可溶于多种有机溶剂，用其制备的气体分离膜具有良好的热稳定性和机械性能，5%热失重温度为488-555 oC，玻璃化转变温度为451-465 oC，拉伸强度为60.5-97.7 MPa，拉伸模量为1.56-2.62 GPa。这些聚合物具有较高的气体渗透系数和中等的气体分离选择性，CO2的渗透系数最高可达1008 barrer，O2的渗透系数可达200.5 barrer，比表面积最高可达567 g/m2，其中O6FPBPDA-DAT的CO2/CH4分离性能接近91年Robeson上限线，老化后气体分离性能得到了进一步提升。上述结果表明在BPDA的2,2'-位引入大体积侧基可以提高聚合物的自由体积分数和气体渗透系数。

Here, three dianhydrides with different bulky 2,2'-substituents, namely 2,2'-diphenyl-4,4',5,5'-biphenyl-tetracarboxylic phthalic anhydride (PBPDA), 2,2'-bis(2''-trifluoromethylphenyl)-4,4',5,5'-biphenyltetracarboxylic dianhydride (O6FPBPDA), 3,3''',5,5'''-tetrafluoromethyl-[1,1':2',1'':2'',1'''-tetraphenyl]-4,4 ',5,5'-tetracarboxylic dianhydride (12FPBPDA), were prepared from 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA). A series of intrinsically microporous polyimides were prepared from three these dianhydrides and contorted diamines, namely 2,6-diaminotriptycene (DAT), 3,9-diamino-4, 10-dimethyl-6H,12H-5,11-methylenedibenzo[b,f][1,5]diaza-cine (TBDA2) by one-step polycondensation in m-cresol. The structures of these polymers were characterized by 1H NMR and FT-IR. These polymers exhibited good solubility in a variety of organic solvents. These polymers showed good thermal and mechanical properties, with T5% of 488-555 oC, Tg of 451-465 oC, tensile strength of 60.5-97.7 MPa, and modulus of 1.56-2.62 GPa. These polymers displayed high gas permeability and moderate gas selectivity, with CO2 permeability being up to 1008 Barrer, O2 permeability being up to 200.5 Barrer, and the specific surface area being up to 567 g/m2. Further, the CO2/CH4 separation performance of O6FPBPDA-DAT approached the 1991 Robeson upper bounds, and the gas separation performance had been further improved after aging. The above results indicate that the introduction of bulky substituents at the 2,2'-position of BPDA can improve the fractional free volume and gas permeability of the resulting polymers.

杨萌萌（1997-），女，河南省周口市，硕士研究生，主要从事聚酰亚胺气体分离膜的研究。E-mial:yangmm@nimte.ac.cn

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