Citation: Jian Wang, Ying Han Wang. Synthesis of novel aromatic polyimides containing bulky side chain for vertical alignment liquid crystals[J]. Chinese Chemical Letters, ;2008, 19(3): 359-362. doi: 10.1016/j.cclet.2007.12.032 shu

Synthesis of novel aromatic polyimides containing bulky side chain for vertical alignment liquid crystals

Jian Wang ,
Ying Han Wang

State Key Laboratory of Polymer Materials Engineering of China, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China

Received Date: 8 October 2007

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 50773045) and Science and Technology Innovation Foundation of Sichuan University (No. 2005CF09).

In this study, a novel 4-(4-octyloxybenzoyloxy) biphenyl-3', 5'-diaminobenzoate and polyimides based on it were synthesized.The polyimide with mesogenic unit side chain exhibited excellent vertical alignment for nematic liquid crystal (LC). The pretilt angles of LCs above 89° were kept after the rubbing process with 220 mm rubbing strength. The polyimide films as the alignment layer were baked at 120℃ for 12 h, the vertical alignment of LCs was still uniform and stable. Meanwhile, the UV-vis spectra of the novel polyimide films showed the high transparency in a visible wave length.
- Polyimide,
- Liquid crystal,
- Vertical alignment
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