Synthesis and characterization of two series of pressure-sensitive cholesteric liquid crystal elastomers with optical properties. Issue 1 (2nd January 2020)

• Record Type: Journal Article
• Authors: Liu, Ze-Ping; He, Xiao-Zhi; Cong, Yue-Hua; Zhang, Bao-Yan; Meng, Fan-Bao; Tian, Mei; Jia, Ying-Gang
• Is Part Of: Liquid crystals. Volume 47:Issue 1(2020)
• Page Start: 143
• Page End: 153
• Publication Date: 2020-01-02
• Subjects: Cholesteric liquid crystal elastomers -- pressure-sensitive -- selective reflection -- optical properties; Liquid crystals -- Periodicals; 548.905
• DOI: 10.1080/02678292.2019.1642524
• Languages: English
• ISSNs: 0267-8292

Abstract

ABSTRACT: We synthesized two series of cholesteric liquid-crystal elastomers by hydrosilylation among monomers MA containing a cholesteryl group, MB (MC) containing a phenolic hydroxyl group and MD as the crosslinker. The chemical structures of all the monomers and LCEs were confirmed by 1 H NMR and FT-IR. We explored the mesomorphic properties and phase behaviours by TGA, DSC, POM, and XRD. All the LCEs presented elasticity, reversible phase transition, and high thermal stability. For two series of LCEs, the glass transition temperature increased slowly, and the isotropic transition temperature increased obviously. PA-I-PA-V and PB-I-PB-IV displayed selective reflection and colourful Grandjean texture, but PA-VI, PB-V, and PB-VI needed external pressure to show them. Graphical Abstract: