含薄荷醇和胆甾醇的侧链胆甾型液晶聚合物的合成与表征

series of new cholesteric side-chain chiral liquid crystalline polymers were prepared containing cholesteric monomer and non-mesogenic chiral monomer. All polymers were synthesized by graft polymerization using polymethylhydrosiloxane as backbone. The mesomorphic properties were investigated by differential scanning calorimetry(DSC), polarizing optical microscopy(POM) and X-ray diffraction measurements(XRD) and temperature-changing solidistic optical rotation(TCSOR). The chemical structures of the monomers and polymers obtained were confirmed by Fourier transform infrared (FTIR), proton nuclear magnetic resonance spectra(1H NMR). M1 showed cholesteric phase during the heating and the cooling cycle. Polymer P1 were chiral smectic A phase, while P2~P8 were cholesteric phase. Experimental results demonstrated that non-mesogetic chiral moity offered the possibility of application due to its lower glass transition temperature and the glass transition temperatures and isotropization temperatures reduced, and the ranges of the mesophase temperature changed abruptly at first and then smoothly with increasing the content of chiral agent.