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Updated: Sep 27, 2025

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
Published on: October 31, 2019
N-Phenyl-substituted poly(benzimidazole imide)s with high glass transition temperature and low coefficient of thermal
Dandan Li1, Chengyang Wang1, Xiaoying Yan2
1College of Chemistry, Jilin University Changchun 130012 P. R. China zhw@jlu.edu.cn.
Abstract:
To obtain high thermostable materials for flexible display substrates, a series of copoly(benzimidazole imide)s was prepared using 5-amine-2-(4-aminobenzene)-1-phenyl-benzimidazole (N-PhPABZ) and 6(5)-amino-2-(4-aminobenzene)-benzimidazole (PABZ). Incorporating N-phenyl groups effectively healed the brittleness of the poly(benzimidazole imide)s (PBIIs) derived from pyromellitic dianhydride (PMDA), and the resultant homo- and copoly(benzimidazole imide)s displayed an outstandingly high glass transition temperature (T g > 450 °C) and a low coefficient of thermal expansion (CTE < 10 ppm K-1). Furthermore, the influence of removing intermolecular hydrogen bonds on the properties of these poly(benzimidazole imide)s was systematically analyzed. These data provide a feasible method to prepare superheat-resistant poly(benzimidazole imide)s without H-bonding.
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