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Liquid Crystals Volume 47, 2020 - Issue 4
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Article

Synthesis of photosensitive polyimide for liquid crystal alignment under non-polarised UV ageing lamp irradiation and a study on the possible mechanism of alignment

Gang ZhuState Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, PR China
,
Fei WangState Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, PR China
,
Wenjie LiuState Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, PR China
,
Xinjian GongWeifang Hengcai Digital Photo Materials Co., Ltd, Weifang, PR China
,
Pengfei GengWeifang Hengcai Digital Photo Materials Co., Ltd, Weifang, PR China
,
Zhenwei GaoWeifang Hengcai Digital Photo Materials Co., Ltd, Weifang, PR China
&
Yinghan WangState Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, PR ChinaCorrespondence[email protected]
 show all
Pages 489-499 | Received 30 Jul 2019, Accepted 19 Aug 2019, Published online: 03 Sep 2019
 
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ABSTRACT

A new photosensitive polyimide (PI) was successfully synthesised via esterification of PI containing hydroxyl groups with cinnamoyl chloride (CL). The cinnamate (CA) group contents of the PI was up to 90%. The PI films could induce uniform parallel alignment of liquid crystal (LC) molecules after the non-polarised ultraviolet ageing lamp exposure, which reduce the cost significantly compared with polarised ultraviolet light equipment. In addition, the PI exhibited good thermal stability. Meanwhile, the possible mechanism of PI alignment films induced by NPUVL was discussed in some detail.

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Disclosure statement

No potential conflict of interest was reported by the authors.

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