Abstract
Poly[6-(4-cyanobiphenyl-4'-oxy)-hexylmetylsiloxanes] (PCS-n) with various degrees of substitution (DS) were prepared, and the effects of the degree of substitution on the phase transition, structures, and liquid crystallization of PCS-n were investigated. PCS-n showed S Ad in the temperature range from glass transition temperature (T s ) to clearing temperature (T i ) in spite of various DS. T 2 and increased linearly with DS, and the temperature range of S A phase between T g and T i expanded with DS. The layer spacing d L of the S A structure decreased with increasing DS, since the non-mesogenic flexible backbones were squeezed between smectic layers. d L of the sample with lower DS highly decreased with increasing temperature, due to entropy relaxation of backbones between the S A layers. DS remarkably influenced the liquid crystallization of PCS-n. PCS-n with higher DS exhibited faster growth rates of liquid-crystalline textures compared with lower DS.
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