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Liquid Crystals Volume 48, 2021 - Issue 8
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Article

The impact of the flexibility of photosensitive polyimide backbone on the properties of liquid-crystal alignment under non-polarised ultraviolet light

Fei Wanga State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, PR China
,
Gang Zhua State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, PR China
,
Xinjian Gongb Weifang Hengcai Digital Photo Materials Co., Ltd, Weifang, PR China
,
Pengfei Gengb Weifang Hengcai Digital Photo Materials Co., Ltd, Weifang, PR China
,
Zhenwei Gaob Weifang Hengcai Digital Photo Materials Co., Ltd, Weifang, PR China
&
Yinghan Wanga State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, PR ChinaCorrespondence[email protected]
Pages 1111-1119 | Received 27 Jul 2020, Accepted 31 Oct 2020, Published online: 29 Nov 2020
 
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ABSTRACT

In order to study the impact of the flexibility of photosensitive polyimide (PI) backbone on the properties of liquid crystal (LC) alignment under non-polarised ultraviolet light (NPUVL), two kinds of photosensitive PI with different backbone structures were synthesised through the polymerisation of 2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane (AHHFP) with 4,4ʹ-(Hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 4,4ʹ-oxydiphthalic anhydride (ODPA) respectively. Polarising optical microscope showed that the irradiation time for ODPA-PI-CA is shorter that for 6FDA-PI-CA in order to induce uniform LC alignment. The reason was investigated in detail with the UV-Vis spectra and reaction kinetics of the photosensitive group.

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Disclosure statement

No potential conflict of interest was reported by the authors.

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