Thermally Induced Pitch Gradients in Side-Chain Cholesteric Liquid Crystalline Polymers

Abstract:

It is reported that a pitch gradient is formed in a side chain cholesteric liquid crystalline polymer (ChLCP) through a novel method. Heating up the ChLCP within the temperature range of the cholesteric (Ch) phase leads to the first availability of its planar texture. Then, the ChLCP film with the planar texture is cooled down to its glassy (G) state in line with the temperature difference between the upper and the bottom substrates. The SEM image indicates clearly a pitch gradient perpendicular to the substrates, and the results of transmission spectra show that the reflective bandwidth of the ChLCP film with the pitch gradient is greatly broadened.

• Periodical: Advanced Materials Research (Volumes 311-313)
• Pages: 1323-1326
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.311-313.1323
• Online since: August 2011
• Authors: Jiu Mei Xiao, Li Long Yu, Dong Yu Zhao, Wan Li He, Hui Cao, Huai Yang
• Keywords: Cholesteric Liquid Crystalline Polymer, Cholesteric Phase, Glassy Phase, Pitch, Pitch Gradient

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