A novel orientation material for liquid crystals based on modified ladder-like polysiloxanes
✍ Scribed by Yongxing Tang; Li Cui; Ping Xie; Rongben Zhang; Zhiyong Zhang; Boquan Wan
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 491 KB
- Volume
- 198
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
A new orientation material for liquid crystals (LCs) based on modified ladder-like polysiloxanes (LPSs) is investigated. The curing temperature (150-200°C) of these grafted LPSs is much lower than that of the traditionally used polyimides (PIS) (250-300 "C). The pre-tilt angles of a nematic liquid crystal (LC), 4-pentyl-4'-cyanobiphenyl (5CB), are between 2-8", depending on the rubbing conditions and the side chains. Annealing experiments at 100°C and 180°C demonstrated that the stability of these orientation films is quite well. a) This project was supported by NSFC (No. 29574187).