Liquid crystalline polymers XIV. Main chain thermotropic copoly(arylidene-ether)s based on 4-methyl-cyclohexanone and 4-tertiary-butyl-cyclohexanone moieties linked with polymethylene spacers

摘要: A new interesting class of thermotropic liquid crystalline copoly(arylidene-ether)s based on cyclohexanone derivative moieties was synthesised by solution polycondensation 4,4′- diformyl-α,ω-diphenoxyalkanes (Ia−f) or diformyl-2,2′- dimethoxy-α,ω-diphenoxyalkanes (IIa−f) with methyl-cyclohexanone and 4-tertiary-butyl-cyclohexanone monomers. model compound III from X benzaldehyde characterised elemental spectral analyses. The inherent viscosities the resulting polymers were in range 0.23−0.91 dL/g. All insoluble common organic solvents but partially soluble halogenated solvents. mesomorphic properties these studied as a function diphenoxyalkane space length. Their examined differential scanning calorimetry (DSC) optical polarising microscopy it demonstrated that form nematic mesophases over wide temperatur...