Abstract
Dielectric spectroscopy of liquid crystalline cyanobiphenyl polyacrylates (CBPA6) with sixmethylene groups in the side chain has been investigated in the frequency range of 30 Hz–13 MHzand in the temperature interval from 100 to 470 K. From the temperature dependence ofε′(T), theanomalies corresponding to sequential phase transitions of liquid crystalline mesophases were revealed. Theobserved α- and δ-relaxation processes were described by the Vogel–Fulcher–Tammann law. It was found thatδ-relaxationexhibits a multistage slowing behavior with decreasing temperature. The existence of a reentrant nematic(Nre) phase upper glassy phase shows us the special conditions for glass transition:the enhancement of the degree of cooperativity in mesogenic subsystems due tocorrugation effects results in interaction of the side chain modes with a mixture ofsegmental and normal modes of the backbone, leading to a step-like anomaly ofε′(T) at the glass transition.
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