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Ternary copolymerization photosensitive polyimide containing flexible group for liquid crystal alignment film

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Abstract

Ternary copolymerized polyimide (BBO-PI-OH) was successfully synthesized by copolymerization of 4,4'-oxydiphthalic anhydride (ODPA) and 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA) with 2,2-bis (3-amino-4-hydroxyphenyl) propane (BAP). Using BBO-PI-OH as raw materials, a novel photosensitive polyimide (BBO-PI-CA) was synthesized by esterification with cinnamate chloride. BBO-PI-CA films show great transmittance in visible region (400–700 nm) and the transmittance at 400 nm is 84.67%. It can induce parallel alignment of liquid crystals (LCs) with the pretilt angle at 0.3° after irradiated by non-polarized ultraviolet light (NPUVL) for 10 min. Its alignment performance remains unchanged after 8 h at 120 °C. BBO-PI-CA displays excellent solubility and thermal properties, which initial thermal decomposition temperature (Td5) is 344 °C.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant No. 22179087).

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Authors and Affiliations

  1. State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, People’s Republic of China

    Mengyao Li, Yuanhao Xu, Jiaqiang Qin, Yinghan Wang & Pei Cheng

  2. Weifang Hengcai Digital Photo Materials Co., Ltd, Weifang, People’s Republic of China

    **njian Gong, Pengfei Geng & Zhenwei Gao

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  1. Mengyao Li
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  2. Yuanhao Xu
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  3. **njian Gong
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  4. Pengfei Geng
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  6. Jiaqiang Qin
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  7. Yinghan Wang
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  8. Pei Cheng
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Correspondence to Yinghan Wang.

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Li, M., Xu, Y., Gong, X. et al. Ternary copolymerization photosensitive polyimide containing flexible group for liquid crystal alignment film. J Polym Res 29, 287 (2022). https://doi.org/10.1007/s10965-022-03154-8

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