Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (11): 20220357.doi: 10.7503/cjcu20220357

• Polymer Chemistry • Previous Articles     Next Articles

Gas Separation Performance of Polyimide Homogeneous MembranesContaining tert-Butyl Groups

WANG Shoubai1,2, WU Xiuming, SHU Chen, ZHONG Min, HUANG Wei(), YAN Deyue   

  1. 1.Xinglin College
    2.School of Chemistry and Chemical Engineering,Nantong University,Nantong 226019,China
    2.School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China
  • Received:2022-05-20 Online:2022-11-10 Published:2022-09-21
  • Contact: HUANG Wei
  • Supported by:
    the Equipment Research and Development Sharing Technology Project, China(41421060301)


A series of soluble aromatic polyimides containing tert-butyl groups were synthesized by the one-pot high-temperature polycondensation. The corresponding homogeneous membranes were prepared by the solution casting method and then their gas separation performances were measured. The effects of dianhydride chemical structures and temperature on the gas separation performance of these polyimide membranes were investigated in detail. For five kinds of gases(including H2, N2, O2, CO2 and CH4), all of them exhibited good gas permeability with the high gas permselectivity, especially the polyimide membranes containing 4,4'-(hexafluoroisopropylidene)diphthalic anhydride(6FDA) or pyromellitic dianhydride(PMDA). Except for CO2, the gas permeability coefficients increased with increasing the temperature for these two kinds of polyimide membranes, while the diffusion coefficients and solubility coefficients of the five gases were increased with increasing the temperature.

Key words: Polyimide homogeneous membrane, Gas separation, tert-Butyl group

CLC Number: