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  • Processable, high Tg polyimides from unsymmetrical diamines containing 4-phenoxy aniline and benzimidazole moieties
  • 来源:陈国飞研究员个人网站 2020-08-03
  • Two novel unsymmetric diamine isomers, 6-amino-2-(4-(4-aminophenoxy)phenyl)-1H-benzimidazole (3p) and 6-amino-2-(3-(4-aminophenoxy)phenyl)-1H-benzimidazole (3 m), were synthesized and employed to react with several aromatic dianhydrides to yield two new series of poly (benzimidazole imide)s (PBIPIs), PI-4 (a-e) and PI-5 (c-e) through two-step and one step polymerization method, respectively. The effect of chain isomerism on molecular packing and physical properties of PBIPIs is investigated. Both series exhibited excellent thermal stability (T5% 503-559 C), high Tg values (276-383 C) and good mechanical properties (tensile strengths of 98e151 MPa and tensile moduli of 3.5-5.2 GPa). The PI-5 (c-e) showed high solubility compared to PI-4 (a-e) series. Such improved solubility attributed to the flexible ether connecting groups with non-coplanarity. Furthermore, controlled molecular weight (Mw) polymer PI-5e-PA derived from 3m, demonstrated good solution and melt processability.


  • [来源:中国聚合物网]
  • 了解更多请进入: 陈国飞研究员个人网站
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