Synthesis of novel colorless polyimides from benzimidazole diamines with various linearity,Journal of Polymer Science

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Synthesis of novel colorless polyimides from benzimidazole diamines with various linearity
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2024-01-19 , DOI: 10.1002/pol.20230792
Ke Xu ₁ , Zhao Ke ₁ , Dongpeng Li ₁ , Tao Li ₁ , Guangtao Qian ₂ , Zhiqing Deng ₃ , Dandan Li ₁ , Youhai Yu ₁

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To synthesize colorless superheat-resistant polyimide films, one of the valid approaches is the incorporation of the asymmetric and warped structures in the main chain. Applying this approach on 5(6)-amino-2-(4-aminobenzene)benzimidazole (PABZ) and changing its linearity, 6, 5′-diamine-2′-methyl-1-methyl-2-phenylbenzimidazole (5a) and 6, 3′-diamine-2′-methyl-1-methyl-2-phenylbenzimidazole (5b) were devised and synthesized successfully, then polymerized with 1,2,4,5-cyclohexanetetracarboxylic dianhydride (HPMDA). The prepared poly(benzimidazole imide)s (PBIIs) with the rigid main chain and loose packing had the excellent heat-resistant level (T_g > 400°C) and optical properties (T₄₀₀ > 80%). Besides, the alterations resulting from various linearities were discussed comprehensively. This research is beneficial to the application of optical field, providing a promising candidate of heat-resistant colorless materials.

中文翻译：

不同线性苯并咪唑二胺合成新型无色聚酰亚胺

为了合成无色耐过热聚酰亚胺薄膜，有效的方法之一是在主链中引入不对称和翘曲结构。将此方法应用于 5(6)-氨基-2-(4-氨基苯)苯并咪唑 (PABZ) 并改变其线性，6, 5'-二胺-2'-甲基-1-甲基-2-苯基苯并咪唑 (5a) 和6、设计并成功合成了3′-二胺-2′-甲基-1-甲基-2-苯基苯并咪唑(5b)，然后与1,2,4,5-环己烷四甲酸二酐(HPMDA)聚合。所制备的具有刚性主链和松散堆积的聚苯并咪唑酰亚胺(PBII)具有优异的耐热水平( T _g > 400℃)和光学性能( T ₄₀₀ > 80%)。此外，还全面讨论了各种线性引起的变化。该研究有利于光学领域的应用，为耐热无色材料提供了一种有前景的候选材料。

更新日期：2024-01-19

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