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Journal of Polymer Research

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01.10.2022 | Original Paper

Preparation and properties of laterally tert-butyl-substituted cyclohexyl-containing polyimide alignment layers with high pretilt angles for potential applications in twisted-nematic TFT-LCDs

verfasst von: Xin-xin Zhi, Hua-sen Wang, Jie Jia, Yan-shuang Gao, Xiao-lei Wang, Yan Zhang, Jin-gang Liu

Erschienen in: Journal of Polymer Research | Ausgabe 10/2022

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Abstract

Polyimide (PI) has been widely used as the alignment layers for twisted-nematic (TN) thin film transistor driven liquid crystal display devices (TFT-LCDs). However, the currently PI alignment layers based on 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA) and common aromatic diamines usually showed low alignment abilities to rigid-rod liquid crystal (LC) molecule with low pretilt angles. Thus, in the current work, a series of novel PI precursors, poly(amic acid)s (PAAs) alignment agents were developed. For this purpose, four PAAs have been prepared from a newly developed ester-linked aromatic diamine containing tert-butyl-substituted cyclohexyl in the side chain, 4'-tert-butyl-cyclohexyl-3,5-diaminobenzoate (DABC) and various dianhydrides. The PAAs included three ones derived from aliphatic or alicyclic dianhydrides, including PAA-1 (BDA-DABC) from 1,2,3,4-butanetetracarboxylic dianhydride (BDA), PAA-2 (CBDA-DABC) from CBDA, and PAA-3 (DMCBDA-DABC) from 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride (DMCBDA), and one from aromatic dianhydride, 2,2′-bis(3,4-dicarboxylphenyl)hexafluoropropane dianhydride (6FDA) (PAA-4, 6FDA-DABC). The derived PAAs were used as the alignment agents to fabricate the minicells of twisted-nematic (TN) modes of thin-film transistor driven liquid crystal display (TFT-LCDs). The PI alignment layers obtained by the thermal imidization of the corresponding PAAs, followed by rubbing treatments showed good alignment ability to the liquid crystal (LC) molecules with the pretilt angles (θ_p) in the range of 1.46 ~ 7.02°. PI-3 (DMCBDA-DABC) showed the highest θ_p of 7.02°, while PI-4 (6FDA-DABC) exhibited the lowest one of 1.46°. The semi-aromatic PI-1 ~ PI-3 layers showed higher optical transmittance than that of the wholly aromatic PI-4 counterpart. PI-4 layer exhibited the lowest voltage holding ratio (VHR) of 91.32% at 60 °C, which was apparently lower than those of the semi-aromatic PI-1 ~ PI-3 counterparts (> 96.00%). In addition, the semi-alicyclic PI alignment layers (PI-2 and PI-3) showed lower residual direct circuit voltages (RDC) than that of the wholly aromatic PI-4. At last, the photoalignment behaviors of the PI alignment layers were preliminarily investigated. Only PI-2 and PI-3 exhibited the alignment ability to the LC molecules after being treated with the linear polarized ultraviolet (LPUV) with the wavelength of 254 nm.

Vorheriger Artikel Copolymerization of cyclic monomers by nickel α-diimine catalysts: catalyst structure, polymer characterization

Nächster Artikel Thermal scratch healing of poly(methyl methacrylate-co-methacrylate) ionomers neutralized with various cations

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Titel: Preparation and properties of laterally tert-butyl-substituted cyclohexyl-containing polyimide alignment layers with high pretilt angles for potential applications in twisted-nematic TFT-LCDs
verfasst von: Xin-xin Zhi
Hua-sen Wang
Jie Jia
Yan-shuang Gao
Xiao-lei Wang
Yan Zhang
Jin-gang Liu
Publikationsdatum: 01.10.2022
Verlag: Springer Netherlands
Erschienen in: Journal of Polymer Research / Ausgabe 10/2022
Print ISSN: 1022-9760
Elektronische ISSN: 1572-8935
DOI: https://doi.org/10.1007/s10965-022-03262-5

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