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Synthesis and Properties of 6FDA‐MDA Copolyimide Membranes: Effects of Diamines and Dianhydrides on Gas Separation and Pervaporation Properties
Author(s) -
Xiao Shude,
Feng Xianshe,
Huang Robert Y. M.
Publication year - 2007
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200700328
Subject(s) - pervaporation , membrane , moiety , gas separation , diamine , monomer , polymer chemistry , polyimide , condensation polymer , permeation , steric effects , materials science , chemical engineering , chemistry , organic chemistry , polymer , biochemistry , layer (electronics) , engineering
Abstract 6FDA‐MDA‐based polyimides were synthesized from a one‐step polycondensation of 6FDA and MDA with other diamines and dianhydrides. The polyimides were characterized by GPC, FT‐IR and NMR, and dense membranes were prepared from their solutions for gas separation and pervaporation. Gas separation and pervaporation properties were investigated using the linear moiety contribution method. The moiety contribution factors were used to analyze the effects of the dianhydride and diamine monomers on gas permselectivity and pervaporation permeation flux. It was shown that the steric effects and flexibility of the monomers and the interactions between the membrane and the penetrants accounted for the differences in separation properties.