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Properties of gas separation membranes based on 2,2 '-bisubstituted BPDA-based polyimides

Authors： Mengmeng Yang, Mengru Zhang, Aimin Chen

Units： 1. Zhejiang University of Technology, School of Chemical Engineering, Hangzhou 310014; 2. Laboratory of Polymers and Composites，Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201

KeyWords： 2,2'-Substitued BPDA, Bulky substituents, Polyimide, Gas separation performance

ClassificationCode：TQ31

year,volume(issue):pagination： 2023,43(2):59-67

Abstract：

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.

Funds：

江省自然科学基金项目(LY19B050004)

AuthorIntro：

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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