Cholesteric fluorescent liquid crystal polysiloxanes with different liquid crystal side chain lengths—Synthesis and properties

With polymethylhydrogensiloxane (PMHS) as the main chain, two series side-chain cholesteric liquid crystal polymers (ChLCPs) with different liquid crystal side chain lengths were prepared by hydrosilylation reaction. Then two series of cholesteric fluorescent liquid crystal polymers (FL-ChLCPs) were obtained by etherification reaction. The obtained FL-ChLCPs have both excellent mesomorphic behavior, and great photoluminescent property. We confirmed their chemical structures by FT-IR, and 1 H NMR spectroscopy , and found them with excellent thermal stability by TGA . We characterized their mesomorphic behavior and thermal performance by POM, DSC and XRD , and confirmed all the polymers belonged to cholesteric phase. FL-ChLCPs emitted different-intensity fluorescence under UV light, and we found some regularity by PL spectrum.