Synthesis, characterization, and CO2 permeation properties of acetylene-terminated polyimide membranes

Abstract

A novel fluorine-containing telechelic polyimide end-capped with acetylene group which derived from 4,4-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), 3,4-diaminodiphenyl ether (DADE), and 4-(2-phenylethynyl) phthalic anhydride (PEPA) was synthesized using polycondensation. The physical and CO2 permeation properties of its crosslinked membranes prepared by the cyclotrimerization reaction of the acetylene groups at the polymer chain end using tantalum (V) chloride (TaCl5) as a catalyst under thermal treatment was investigated in terms of CO2-induced membrane plasticization. The crosslinked membranes showed a gel content in organic solvent, which was good solvent of noncrosslinked mem..