Novel high T_g, organosoluble poly(ether imide)s containing 4,5-diazafluorene unit: Synthesis and characterization

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• 作者：Hui Li ; Shujiang Zhang ; Chengliang Gong ; Yu Liang ; Zhigang Qi ; Yanfeng Li ; ^{liyf@lzu.edu.cn" class="auth_mail}
• 关键词：Poly(ether imide)s ; 9 ; 9-di[4-(4-Aminophenoxy)phenylene]-4 ; 5-diazafluorene ; Organo-soluble ; Thermal stability ; 4 ; 5-Diazafluorene
• 刊名：European Polymer Journal
• 出版年：May, 2014
• 年：2014
• 卷：54
• 期：Complete
• 页码：128-137
• 全文大小：1643 K

文摘

The synthesis of aromatic poly(ether imide)s containing 4,5-diazafluorene units in the polymer backbone is described. 9,9-di[4-(4-Aminophenoxy)phenylene]-4,5-diazafluorene (3), which was used as a new monomer, was synthesized with 4,5-diazafluoren-9-one as the starting material. This diamine monomer was employed in reactions with a variety of aromatic dianhydrides to furnish poly(ether imide)s. These 4,5-diazafluorene-based polymers showed solubility in polar amidic solvents such as NMP, DMAc and DMF, good optical transparency, and high thermal stability. The glass transition temperatures (T_g) of these poly(ether imide)s were recorded between 325 and 356 掳C with the help of differential scanning calorimetry (DSC), and the T_g determined by dynamic mechanical thermal analyses (DMA) stayed in the range of 329-363 掳C, and the 10% weight-loss temperatures all occurred above 560 掳C in both nitrogen and air atmospheres. In addition, the flexible polyimide films possessed tensile strengths in the range of 64-101 MPa, tensile modulus of 1.8-2.1 GPa, and elongations at break of 6-13%.