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Processable, high Tg polyimides from unsymmetrical diamines containing 4-phenoxy aniline and benzimidazole moieties

Sidra, Lala Rukh ; Chen, Guofei ; Li, Cuiyun ; Mushtaq, Nafeesa ; Ma, Kai ; Fang, Xingzhong

Polymer, 18 July 2018, Vol.148, pp.228-238 [Peer Reviewed Journal]

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  • Title:
    Processable, high Tg polyimides from unsymmetrical diamines containing 4-phenoxy aniline and benzimidazole moieties
  • Author: Sidra, Lala Rukh ; Chen, Guofei ; Li, Cuiyun ; Mushtaq, Nafeesa ; Ma, Kai ; Fang, Xingzhong
  • Description: 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 (  = 503–559 °C), high values (276–383 °C) and good mechanical properties (tensile strengths of 98–151 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 ( ) polymer PI-5e-PA derived from 3 m, demonstrated good solution and melt processability.
  • Is Part Of: Polymer, 18 July 2018, Vol.148, pp.228-238
  • Identifier: ISSN: 0032-3861 ; E-ISSN: 1873-2291 ; DOI: 10.1016/j.polymer.2018.06.036
  • Subjects: Poly(Benzimidazole Imide)S ; Unsymmetric Benzimidazole Diamine ; Processability ; Engineering ; Chemistry
  • Language: English

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