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In this paper, we designed and synthesised two azo liquid crystal monomers ( M1  and  M2 ) and a chiral liquid crystal monomer  N , followed by side-chain graft copolymerisation with polymethylhydrosiloxane (PMHS) to synthesize comb-like liquid crystalline polymers  PN1  and  PN2 . The structures of all liquid crystal monomers and polymers conform to the molecular designs by FT-IR and  1 H NMR. The liquid crystal properties were tested by DSC and POM, and the results showed that  M1  and  M2  were thermotropic enantiotropic nematic liquid crystals and  N  was a thermotropic enantiotropic cholesteric liquid crystal. Both the  PN1  and  PN2  series were amorphous polymers. The  PN1  and  PN2  series exhibited a typical Grand-jean texture. The glass transition temperature and isotropic temperature of the  PN1  and  PN2  series decreased first and then increased with the increase of azo monomer  M  content. And the glass transition temperature and isotropic temperature of the  PN1  series were higher than the  PN2  series. Both the  PN1  and  PN2  series had good thermal stability. The mesophase range of the  PN1  series was 173.5°C~181.5°C, and the  PN2  series was 162.5°C~172.9°C.

Synthesis and phase behaviour of a class of comb-like cholesteric azobenzene liquid crystalline polymers