Preparation and Characterization of Semi-Alicyclic Polyimide Resins and the Derived Alignment Layers for Liquid Crystal Display Technology

Uniform alignment of rigid-rod liquid crystal (LC) molecules under applied voltage is critical for achievement of high-quality display for thin-film transistor-driven liquid crystal display devices (TFT-LCDs). The polymeric components that can induce the alignment of randomly aligned LC molecules ar...

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Main Authors:	Hong-sheng Bi, Xin-xin Zhi, Peng-hui Wu, Yan Zhang, Lin Wu, Yao-yao Tan, Yan-Jiang Jia, Jin-gang Liu, Xiu-min Zhang
Format:	Article
Language:	English
Published:	MDPI AG 2020-01-01
Series:	Polymers
Subjects:	semi-alicyclic polyimide alignment layer thin-film transistor-driven liquid crystal display device (tft-lcd) voltage holding ratio residual direct circuit voltage
Online Access:	https://www.mdpi.com/2073-4360/12/1/217

id	doaj-4ea1ddfca39646a2923ff9854b42f3ab
record_format	Article
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Hong-sheng Bi Xin-xin Zhi Peng-hui Wu Yan Zhang Lin Wu Yao-yao Tan Yan-Jiang Jia Jin-gang Liu Xiu-min Zhang
spellingShingle	Hong-sheng Bi Xin-xin Zhi Peng-hui Wu Yan Zhang Lin Wu Yao-yao Tan Yan-Jiang Jia Jin-gang Liu Xiu-min Zhang Preparation and Characterization of Semi-Alicyclic Polyimide Resins and the Derived Alignment Layers for Liquid Crystal Display Technology Polymers semi-alicyclic polyimide alignment layer thin-film transistor-driven liquid crystal display device (tft-lcd) voltage holding ratio residual direct circuit voltage
author_facet	Hong-sheng Bi Xin-xin Zhi Peng-hui Wu Yan Zhang Lin Wu Yao-yao Tan Yan-Jiang Jia Jin-gang Liu Xiu-min Zhang
author_sort	Hong-sheng Bi
title	Preparation and Characterization of Semi-Alicyclic Polyimide Resins and the Derived Alignment Layers for Liquid Crystal Display Technology
title_short	Preparation and Characterization of Semi-Alicyclic Polyimide Resins and the Derived Alignment Layers for Liquid Crystal Display Technology
title_full	Preparation and Characterization of Semi-Alicyclic Polyimide Resins and the Derived Alignment Layers for Liquid Crystal Display Technology
title_fullStr	Preparation and Characterization of Semi-Alicyclic Polyimide Resins and the Derived Alignment Layers for Liquid Crystal Display Technology
title_full_unstemmed	Preparation and Characterization of Semi-Alicyclic Polyimide Resins and the Derived Alignment Layers for Liquid Crystal Display Technology
title_sort	preparation and characterization of semi-alicyclic polyimide resins and the derived alignment layers for liquid crystal display technology
publisher	MDPI AG
series	Polymers
issn	2073-4360
publishDate	2020-01-01
description	Uniform alignment of rigid-rod liquid crystal (LC) molecules under applied voltage is critical for achievement of high-quality display for thin-film transistor-driven liquid crystal display devices (TFT-LCDs). The polymeric components that can induce the alignment of randomly aligned LC molecules are called alignment layers (ALs). In the current work, a series of organo-soluble polyimide (SPI) ALs were designed and prepared from an alicyclic dianhydride, hydrogenated 3,3′,4,4′-biphenyltetracarboxylic dianhydride (HBPDA), and various aromatic diamines, including 4,4′-methylenedianiline (MDA) for SPI-1, 4,4′-aminodianiline (NDA) for SPI-2, 3,3′,5,5′-tetramethyl-4,4′-diaminodiphenylmethane (TMMDA) for SPI-3, and 3,3′-diethyl-5,5′-dimethyl-4,4′-diaminodiphenylmethane (DMDEDA) for SPI-4. The derived SPI resins were all soluble in <i>N</i>-methyl-2-pyrrolidone (NMP). Four SPI alignment agents with the solid content of 6 wt.% were prepared by dissolving the SPI resins in the mixed solvent of NMP and butyl cellulose (BC) (NMP/BC = 80:20, weight ratio). Liquid crystal minicells were successfully fabricated using the developed SPI varnishes as the LC molecule alignment components. The SPI ALs showed good alignment ability for the LC molecules with the pretilt angles in the range of 1.58°−1.97°. The LC minicells exhibited good optoelectronic characteristics with voltage holding ratio (VHR) values higher than 96%. The good alignment ability of the SPI ALs is mainly attributed to the good comprehensive properties of the SPI layers, including high volume resistivity, high degree of imidization at the processing temperature (230 °C), good rubbing resistance, good thermal stability with glass transition temperatures (<i>T</i><sub>g</sub>s) higher than 260 °C, and excellent optical transparency with the transmittance higher than 97% at the wavelength of 550 nm.
topic	semi-alicyclic polyimide alignment layer thin-film transistor-driven liquid crystal display device (tft-lcd) voltage holding ratio residual direct circuit voltage
url	https://www.mdpi.com/2073-4360/12/1/217
work_keys_str_mv	AT hongshengbi preparationandcharacterizationofsemialicyclicpolyimideresinsandthederivedalignmentlayersforliquidcrystaldisplaytechnology AT xinxinzhi preparationandcharacterizationofsemialicyclicpolyimideresinsandthederivedalignmentlayersforliquidcrystaldisplaytechnology AT penghuiwu preparationandcharacterizationofsemialicyclicpolyimideresinsandthederivedalignmentlayersforliquidcrystaldisplaytechnology AT yanzhang preparationandcharacterizationofsemialicyclicpolyimideresinsandthederivedalignmentlayersforliquidcrystaldisplaytechnology AT linwu preparationandcharacterizationofsemialicyclicpolyimideresinsandthederivedalignmentlayersforliquidcrystaldisplaytechnology AT yaoyaotan preparationandcharacterizationofsemialicyclicpolyimideresinsandthederivedalignmentlayersforliquidcrystaldisplaytechnology AT yanjiangjia preparationandcharacterizationofsemialicyclicpolyimideresinsandthederivedalignmentlayersforliquidcrystaldisplaytechnology AT jingangliu preparationandcharacterizationofsemialicyclicpolyimideresinsandthederivedalignmentlayersforliquidcrystaldisplaytechnology AT xiuminzhang preparationandcharacterizationofsemialicyclicpolyimideresinsandthederivedalignmentlayersforliquidcrystaldisplaytechnology
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spelling	doaj-4ea1ddfca39646a2923ff9854b42f3ab2020-11-25T01:47:08ZengMDPI AGPolymers2073-43602020-01-0112121710.3390/polym12010217polym12010217Preparation and Characterization of Semi-Alicyclic Polyimide Resins and the Derived Alignment Layers for Liquid Crystal Display TechnologyHong-sheng Bi0Xin-xin Zhi1Peng-hui Wu2Yan Zhang3Lin Wu4Yao-yao Tan5Yan-Jiang Jia6Jin-gang Liu7Xiu-min Zhang8Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaBeijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaBeijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaBeijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaBeijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaBeijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaBeijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaBeijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, ChinaUniform alignment of rigid-rod liquid crystal (LC) molecules under applied voltage is critical for achievement of high-quality display for thin-film transistor-driven liquid crystal display devices (TFT-LCDs). The polymeric components that can induce the alignment of randomly aligned LC molecules are called alignment layers (ALs). In the current work, a series of organo-soluble polyimide (SPI) ALs were designed and prepared from an alicyclic dianhydride, hydrogenated 3,3′,4,4′-biphenyltetracarboxylic dianhydride (HBPDA), and various aromatic diamines, including 4,4′-methylenedianiline (MDA) for SPI-1, 4,4′-aminodianiline (NDA) for SPI-2, 3,3′,5,5′-tetramethyl-4,4′-diaminodiphenylmethane (TMMDA) for SPI-3, and 3,3′-diethyl-5,5′-dimethyl-4,4′-diaminodiphenylmethane (DMDEDA) for SPI-4. The derived SPI resins were all soluble in <i>N</i>-methyl-2-pyrrolidone (NMP). Four SPI alignment agents with the solid content of 6 wt.% were prepared by dissolving the SPI resins in the mixed solvent of NMP and butyl cellulose (BC) (NMP/BC = 80:20, weight ratio). Liquid crystal minicells were successfully fabricated using the developed SPI varnishes as the LC molecule alignment components. The SPI ALs showed good alignment ability for the LC molecules with the pretilt angles in the range of 1.58°−1.97°. The LC minicells exhibited good optoelectronic characteristics with voltage holding ratio (VHR) values higher than 96%. The good alignment ability of the SPI ALs is mainly attributed to the good comprehensive properties of the SPI layers, including high volume resistivity, high degree of imidization at the processing temperature (230 °C), good rubbing resistance, good thermal stability with glass transition temperatures (<i>T</i><sub>g</sub>s) higher than 260 °C, and excellent optical transparency with the transmittance higher than 97% at the wavelength of 550 nm.https://www.mdpi.com/2073-4360/12/1/217semi-alicyclic polyimidealignment layerthin-film transistor-driven liquid crystal display device (tft-lcd)voltage holding ratioresidual direct circuit voltage

Preparation and Characterization of Semi-Alicyclic Polyimide Resins and the Derived Alignment Layers for Liquid Crystal Display Technology

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