Zz. Zhong et al., INFLUENCE OF SPACER LENGTH ON THE DIELECTRIC-RELAXATION OF A SIDE-CHAIN LIQUID-CRYSTAL POLYMER, Liquid crystals, 17(2), 1994, pp. 199-209
The dielectric relaxation study on a set of polyvinylether based cyano
biphenyl side chain liquid crystal polymers with three different alkyl
spacer lengths of 7, 9, and 11 shows that the spacer decouples the mo
tion of the mesogen from the polymer backbone so that both the low-fre
quency delta process and the high-frequency alpha process of the side
group have been detected in smectic A phase. At a given temperature th
e relaxation frequency increases with spacer length for the alpha proc
ess. This trend is also observed for the delta process except for the
longest spacer length.