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- Title
Influence of different spacer length and cholesteric monomer percentage on phase behaviors and thermo-optical properties of cyclic siloxane tetramers containing cholesteric and biphenyl groups.
- Authors
Zhang, Xingfei; Zhang, Lanying; Tan, Jifeng; Wu, Xiaojuan; Li, Birong; Wang, Feifei; Yang, Huai; Yang, Zhou
- Abstract
In this work, two series of cyclic siloxane tetramers based on polysiloxane, cholesterol derivate monomer, and biphenyl derivate monomer were designed and synthesized to investigate the effect of the length of flexible spacer and cholesteric monomer percentage (Xchol) on their mesogenic properties. Results revealed that the tetramers exhibited thermotropic liquid crystalline behaviors and their properties were influenced by various factors. With Xchol increased, abundant mesophases for the tetramers could be observed and their mesogenic temperature ranges were generally widened. Significant effect of the flexible spacer length on the transition temperatures was also found and discussed. Interestingly, blue phases could be easily observed for those tetramers containing more than 50.0 mol% chiral mesogen, and the temperature ranges of blue phase increased with the increasing of Xchol whereas reduced with the decreasing of length of flexible spacer. Moreover, the thermo-optical properties and helical twisting power of the tetramers were also investigated.
- Subjects
SILOXANES; MONOMERS; BIPHENYL compounds; CRYSTALLINE polymers; CHOLESTEROL derivatives; LIQUID crystals; THERMAL properties; OPTICAL properties
- Publication
Journal of Materials Science, 2014, Vol 49, Issue 14, p4927
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-014-8194-3