期刊
MACROMOLECULAR CHEMISTRY AND PHYSICS
卷 214, 期 21, 页码 2405-2414出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201300354
关键词
cholesteric cellulose derivatives; liquid crystals; liquid crystal-dye composites; photonic crystals
资金
- Graduate School of Excellence Material Science in Mainz [GSC 266]
- International Research Training Group [IRTG 1404]
- German Science Foundation (DFG)
- [SFB 625]
Cholesteric liquid crystals based on polymers are attractive because of their film-forming properties. However, their optical properties (sharpness and directionality of the selective reflection) are usually lower than low molar mass compounds because of a polydomain structure and an angular distribution of the helix axes. In this work, cholesteric films made of liquid crystalline cellulose derivatives with improved optical properties are prepared. The careful choice of the solvent, hydrogen bond influencing additives, the synthetic realization of a very high degree of substitution on the cellulosic polymer, and the use of mechanical stirring in combination with a tuned substrate treatment and film-preparation method and subsequent polymerization allow the fabrication of free standing cholesteric films of high optical quality. They show selective reflection with a half width of only 25 nm and nearly only perpendicular reflection. In addition, a method is developed by which fluorescent dyes can be introduced into the films after their preparation.
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