Abstract A water-soluble aromatic polyamide (WAPA) thin film was formed by coating a newly synthesized poly(2,2′-disulfo-4,4′-benzidine isophthalamide) cesium salt (PDBI-Cs). Its electro-optical properties as an alignment layer in liquid crystal devices were analyzed. Twisted nematic-liquid crystal cells containing WAPA alignment layers annealed at a low temperature of 100 °C showed high voltage holding ratio values above 95 % at a frame rate of 60 Hz, a fast response time of 7.18 ms at ac operation of 1 kHz under LC-applied voltage of 5 V, and excellent contrast ratio of 3284 due to the high optical anisotropy effect of the WAPA surface. Thus, PDBI-Cs-based WAPA can be a promising candidate as a new eco-friendly low-temperature-processable alignment layer for flexible electro-optic devices.

中文翻译：

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水溶性芳香聚酰胺作为可低温加工的取向层：聚（2,2'-二磺基-4,4'-联苯胺间苯二甲酰胺）铯盐

摘要 通过涂覆新合成的聚（2,2'-二磺基-4,4'-联苯胺间苯二甲酰胺）铯盐（PDBI-Cs）形成水溶性芳香聚酰胺（WAPA）薄膜。分析了其作为液晶器件中的配向层的电光特性。在 100 °C 的低温下退火的包含 WAPA 取向层的扭曲向列液晶单元在 60 Hz 的帧频下显示出高于 95% 的高电压保持率值，在 1 kHz 的交流操作下的快速响应时间为 7.18 ms由于 WAPA 表面的高光学各向异性效应，LC 施加的电压为 5 V，对比度为 3284。因此，基于 PDBI-Cs 的 WAPA 可以作为一种用于柔性电光器件的新型环保低温加工配向层。