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Water-soluble aromatic polyamide as a low-temperature-processable alignment layer: Poly(2,2’-disulfo-4,4’-benzidine isophthalamide) cesium salt
Progress in Organic Coatings ( IF 3.42 ) Pub Date : 2019-12-26 , DOI: 10.1016/j.porgcoat.2019.105506
Sang Hee Won; Hyeong Wook Kim; Valery Kuzmin; Bo Sung Kim; Sung Tae Shin

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.
更新日期:2019-12-27

 

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