Chem. J. Chinese Universities

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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

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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