新型侧链型聚酰亚胺膜的制备及其渗透汽化分离性能

doi:10.3969/j.issn.0438-1157.2013.02.025

化工学报 ›› 2013, Vol. 64 ›› Issue (2): 590-599.DOI: 10.3969/j.issn.0438-1157.2013.02.025

新型侧链型聚酰亚胺膜的制备及其渗透汽化分离性能

秦琳, 李继定, 郑冬菊, 王涛

清华大学化学工程系,化学工程联合国家重点实验室,北京 100084

收稿日期:2012-08-01 修回日期:2012-11-16 出版日期:2013-02-05 发布日期:2013-02-05
通讯作者: 李继定
作者简介:秦琳(1986—),女,博士研究生。
基金资助:
国家重点基础研究发展计划项目(2009CB623404);国家高技术研究发展计划项目(2012AA03A607);国家自然科学基金项目(21176135)。

Synthesis of novel membranes of polyimide with side-chains and their pervaporation performance

QIN Lin, LI Jiding, ZHENG Dongju, WANG Tao

State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2012-08-01 Revised:2012-11-16 Online:2013-02-05 Published:2013-02-05
Supported by:
supported by the National Basic Research Program of China (2009CB623404), the High-tech Research and Development Program of China (2012AA03A607) and the National Natural Science Foundation of China (21176135).

摘要/Abstract

摘要： 针对苯/环己烷混合物体系的特点,采用两种新型侧链二胺3,5-二氨基苯甲酸苯酯(PDA)和3,5-二氨基苯甲酸-4-三氟甲基苯酯(FPDA),制备了一系列由不同二酐与二胺单体如4,4'-二氨基二苯醚(ODA)和3,5-二氨基苯甲酸(DABA)聚合而成的用于渗透汽化分离苯/环己烷的聚酰亚胺膜,对其结构和各项性质进行了表征,并对膜材料的微观结构与宏观分离性能之间的关系进行了较为深入的研究。随着侧链二胺的引入,聚酰亚胺膜的分离效率随之持续增大,分离能力得以改善。渗透汽化实验结果表明,以6FDA为二酐单体的两类聚酰亚胺膜具有较优异的分离性能。乙二醇交联的6FDA-FPDA/ODA/DABA(1:7:2)膜综合渗透汽化分离性能最优。在50℃时,对于含苯50 %(质量)的苯/环己烷混合物,其渗透通量为9.84 kg·μm·m^-2·h^-1,分离因子达6.1。

关键词: 聚酰亚胺, 侧链, 渗透汽化, 苯/环己烷

Abstract: Two novel aromatic diamines 3,5-diaminobenzophenone (PDA) and 4-(trifluoromethyl)phenyl 3,5-diaminobenzoate (FPDA) were mixed separately with 4,4'-diaminodiphenyl ether (ODA) and 3,5-diaminebenzoic acid (DABA) with different ratios, and then copolymerized separately with 4,4'-oxydiphthalic anhydride (ODPA), 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA) and 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) to give poly(amic acid)s, which were converted into cross-linked polyimides (PIs) with ethylene glycol (EG) by thermal imidization.The structures of these series of PIs were characterized by FT-IR, NMR and GPC.The effect of side-chain content on the thermal stability was investigated by DSC and TGA.The effects of the fluorine group on the properties and separation performance of side-chain polyimides were investigated.The membranes of polyimide obtained were employed in pervaporation separation of benzene/cyclohexane mixtures.The two side-chain polyimide membranes containing 6FDA have an optimal separation efficiency in terms of both flux and separation factor.The cross-linked 6FDA-FPDA/ODA/DABA (1:7:2) membranes show the most promising separation performance with a flux of 9.84 kg·μm·m^-2·h^-1 and separation factor of 6.1 for benzene/cyclohexane (50/50,mass ratio) at 50℃.

Key words: polyimide, side-chains, pervaporation, benzene/cyclohexane

中图分类号:

秦琳, 李继定, 郑冬菊, 王涛. 新型侧链型聚酰亚胺膜的制备及其渗透汽化分离性能[J]. 化工学报, 2013, 64(2): 590-599.

QIN Lin, LI Jiding, ZHENG Dongju, WANG Tao. Synthesis of novel membranes of polyimide with side-chains and their pervaporation performance[J]. CIESC Journal, 2013, 64(2): 590-599.

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新型侧链型聚酰亚胺膜的制备及其渗透汽化分离性能

Synthesis of novel membranes of polyimide with side-chains and their pervaporation performance

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