Synthesis of branched polyimides based on 9,9-bis(4-aminophenyl)fluorene and an oligomeric trianhydride,a 1,3,5-triaminotoluene derivative |
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| Authors: | A A Kuznetsov S N Akimenko A Yu Tzegel’skaya N S Perov G K Semenova A Kh Shakhnes S A Shevelev |
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| Institution: | 1. Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, Profsoyuznaya ul. 70, Moscow, 117393, Russia
2. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninskii pr. 47, Moscow, 119991, Russia
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| Abstract: | A new three-arm reactive oligomer (A3) with three end anhydride groups is prepared via the high-temperature cyclocondensation of 1,3,5-triaminotoluene disulfate with excess 2,2-propylidene-bis(phenyl-4-oxyphthalic acid) dianhydride in molten benzoic acid at 140°C in the presence of 2.2.2]-diazobicyclooctane. A branched polyimide is synthesized via the one-step high-temperature catalytic polycondensation of oligomer A3 with 9,9-bis(4-aminophenyl)fluorene in benzoic acid at 140°C via scheme (A3 + B2) and characterized. |
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