Abstract
The dynamic behaviour of side-chain polyacrylates, whose polymer backbones were connected to a mesogenic core composed of cyanophenyl benzoate or cyanobiphenylyl benzoate via an alkylene (C11) chain or that containing a siloxane bond as a flexible spacer chain, have been studied by dielectric relaxation spectroscopy (102–106 Hz) at different temperatures in the smectic phase. Analyses using the Fuoss–Kirkwood function, WLF equation and activation parameters on the obtained dielectric loss revealed that the siloxane-spacer apparently enhanced the mobility of a mesogenic group owing to a decrease of Tg, and that the introduction of as small a mesogen as possible might be one of the most important factors in responding rapidly to changes of an external field.
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