高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

含有聚醚链段的可溶性聚酰亚胺气体分离膜材料及其性能

邱晓智1,2, 曹义鸣1, 王丽娜1, 周美青1, 袁权1   

    1. 中国科学院大连化学物理研究所, 大连 116023;
    2. 中国科学院研究生院, 北京 100049
  • 收稿日期:2008-05-30 修回日期:1900-01-01 出版日期:2009-01-10 发布日期:2009-01-10
  • 通讯作者: 曹义鸣

Preparation and Properties of Soluble Polyimide Membranes Containing Polyether Segment for Gas Separation

QIU Xiao-Zhi1,2, CAO Yi-Ming1*, WANG Li-Na1, ZHOU Mei-Qing1, YUAN Quan1   

    1. Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China;
    2. China Graduate University of Chinese Academy of Science, Beijing 100049, China
  • Received:2008-05-30 Revised:1900-01-01 Online:2009-01-10 Published:2009-01-10
  • Contact: CAO Yi-Ming

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被引次数

33

摘要： 将4,4'-六氟亚异丙基-邻苯二甲酸酐(6FDA)和1,3-苯二胺(mPDA)与二端氨基聚醚缩聚, 得到含有聚醚柔性链段的聚酰亚胺气体分离膜材料. 所合成的共聚聚酰亚胺在N-甲基吡咯烷酮(NMP)和四氢呋喃(THF)等有机溶剂中具有良好的溶解性能. 研究了O2, N2, H2, CH4和CO2在聚酰亚胺均质膜中的渗透性能, 考察了二端氨基聚醚的含量、链长和化学结构对气体渗透性能的影响. 结果表明, 聚醚链段的引入增大了气体的扩散系数, 气体的渗透系数显著增大; 聚醚链段与CO2相对较强的相互作用, 增大了对CO2/N2的溶解选择性, CO2/N2的分离性能优于CO2/CH4, 同时CO2比H2优先透过膜.

关键词: 气体分离膜, 聚酰亚胺, 聚醚, 渗透系数

Abstract: Polyimide copolymers as materials for gas separation containing polyether soft segment were synthesized from 2,2-bis(3,4-dicarboxyphenyl) hexafluoroprophane dianhydride(6FDA) with m-phenylenediamine(mPDA) and polyether diamine by two steps of condensation polymerization. Permeation properties of O2, N2, H2, CH4 and CO2 were investigated. The co-polyimides were soluble in common solvents such as NMP and THF. The effects of content and structure of the polyether on permeation properties were studied. It was found that introducing soft polyether segment into polyimide main chain increased the diffusion coefficients due to increasing of chain flexibility, and also increased CO2 solubility selectivity due to the strong affinity of ether oxide groups with CO2. The results show that the permeability coefficients of CO2 for co-polyimides are higher than that for 6FDA-mPDA polyimide; the CO2/N2 selectivity is better than CO2/CH4; meanwhile, CO2 permeability coefficients for co-polyimides is higher than H2.

Key words: Gas separation membrane, Polyimide, Polyether, Permeability

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