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Synthesis and gas permeation properties of hyperbranched polyimides membranes from a novel (A2+B2B′+B2)-type method
A series of hyperbranched polyimides were successfully synthesized by A2+B2B′+B2 copolymerization from 2,2-bis(3,4-dicarboxylphenyl) hexafluoropropane dianhydride (6FDA), 2,4,6-triaminopyrimidine (TAP) and 4,4′-oxydianiline (ODA). Self-standing polyimides membranes with sufficient mechanical properties were achieved by incorporation of difunctional B2 comonomer into the hyperbranched...
http://www.polymer.cnt//ss/zhangqiuyu/publicationsshow_7802.html

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