中华医学超声杂志

应用化学 ›› 1993, Vol. 0 ›› Issue (2): 81-83.

• 研究简报 • 上一篇    下一篇

分子结构对6FDA型聚酰亚胺透气性能的影响

李悦生, 丁孟贤, 徐纪平   

  1. 中国科学院长春应用化学研究所 130022 长春
  • 收稿日期:1992-03-11 修回日期:1992-10-26 出版日期:1993-04-10 发布日期:1993-04-10
  • 基金资助:
    国家自然科学基金资助课题

STRUCTURE-PERMEABILITY RELATIONSHIPS OF 6FDA-BASED POLYIMIDE MEMBRANES

Li Yuesheng, Ding Mengxian, Xu Jiping   

  1. Changchun Institute of Applied Chemisty, Chinese Academy of Sciences, 130022 Changchun
  • Received:1992-03-11 Revised:1992-10-26 Published:1993-04-10 Online:1993-04-10

PDF

558

被引次数

21 | 2

摘要： 理想的气体分离膜材料应该同时具有高的透气性和良好的透气选择性、高强度、耐高温、耐化学介质和良好的成膜加工性能,聚酰亚胺是一类具有各种优良性能的气体分离膜材料,其中尤以6FDA型聚酰亚胺最引人注目,这类聚酰亚胺在保持普通聚酰亚胺高性能的基础上,改善了加工性能,它们可溶于极性非质子溶剂,可采用相转换法制成不对称膜。本文报道这类聚酰亚胺的分子结构与气体分离性能的关系。

关键词: 聚酰亚胺, 气体分离, 膜, 透气性

Abstract: The permeability coefficients of five 6FDA-based polyimide membranes to H2, CO2, O2,N2, and CH4 have been meassured at 0.6MPa and 30℃. Differences in chemical structure were found to lead to a significant change in permeability coefficients and were related to the ideal separation factotes of smaller penetrant molecules against biger ones. For polyimides 6FDA-DABP, 6FDA-ODA, 6FDA-MDA and 6FDA-IPDA, the increase in permeability coefficents was accompanied with the decrease of the ideal separation factors. Having the bulky methyl side groups on the aromatic rings of DMMDA, polyimide 6FDA-DMMDA possesses both high PH2 and high αH2/N2 and αH2/CH4. The favorable permseleetivity, excellent thermal and mechanical durability, and good processability make 6FDADMMDA a promising candidate material for gas separation.

Key words: polyimide, gas separation, membrane, gas permeability

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