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A series of cholesterol-containing liquid crystalline side-chain polymers (pChMO-n, n = 5 and 11, the carbon number of the side alkyl chain) and a butoxybiphenyl containing liquid crystalline side-chain polymer (pBBMO-n, n = 6) have been prepared. The dynamic viscoelastic properties of these liquid crystalline polymers in the smectic A and isotropic phases were investigated with parallel-plate simple shear geometry. The slope of G′ against frequency in the smectic A phase is relatively small due to the influence of the smectic structure of the side chains. In the isotropic phase, the slope of G′ curves for these polymers is smaller than that in the flow region observed on isotropic amorphous polymers. Furthermore, the G′ curve for these three polymers in the isotropic phase has various slopes. This difference in the slope in the isotropic phase is accounted for by the difference in the molecular structure such as length of the side flexible spacer and the type of mesogenic groups.
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Yamaguchi et al. (1992) studied this question.
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