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Synthesis and properties of cholesteric liquid crystal elastomers with selective reflection centred on D(+)-camphoric acid

ABSTRACT In this study, a series of cholesteric liquid crystal elastomers (ZSD series) was synthesised by hydrosilylation reaction among monomer ML1 containing cholesteryl group, monomer ML2 as the crosslinking agent, monomer ML3 containing D(+)-camphoric acid group. The chemical structures and mesogenic properties of monomers and elastomers were studied by conventional testing methods. By characterising the liquid crystal elastomers, it was found that they all showed colourful Grandjean texture, good elasticity and high thermal stability. For the ZSD series, the values of Tg first decreased and then increased and the values of Ti always decreased with the change of the content of chiral liquid crystal monomers, and all elastomers had the wide mesophase temperature ranges (ΔT). ZSD1-ZSD3 had selective reflection in the visible light region, while the observation for ZSD4-ZSD7 could only be observed under the appropriate external pressure. The effect of the novel chiral monomer (ML3) on the properties of elastomers had been investigated. Graphical abstract