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

Chem. J. Chinese Universities

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

QIU Xiao-Zhi^1,2, CAO Yi-Ming^1*, 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

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

CLC Number:

O631

TrendMD:

QIU Xiao-Zhi^1,2, CAO Yi-Ming^1*, WANG Li-Na¹, ZHOU Mei-Qing¹, YUAN Quan¹. Preparation and Properties of Soluble Polyimide Membranes Containing Polyether Segment for Gas Separation[J]. Chem. J. Chinese Universities, doi: .

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

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