Gas separating asymmetric membrane
作者： Yoshihiro Kusuki , Toshimune Yoshinaga , Harutoshi Hoshino , Shinji Asanuma
DOI:
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摘要: A gas separating asymmetric membrane such as a hollow fiber comprises an aromatic polyimide comprising recurring units of the formulae (I) and (II): ##STR1## wherein A1 is tetravalent unit having diphenylhexafluoropropane structure, A2 benzene A3 divalent which derived from sulfur atom-containing diamine diaminodibenzothiophene, diaminodiphenylenesulfone, diaminothioxanthene-5,5-dioxide or diaminothioxanthone-5,5-dioxide. The contains formula in amount 40 to 90 molar % (II) 10 %. Further, process for preparation also disclosed.
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