Influence of Molecular Structure on the Low Frequency Dielectric Relaxation ofp-Cyano-substituted Liquid Crystals in Nematic Solution

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Abstract
The dielectric properties of several p-alkyl-p'-cyano-substituted liquid crystals of different molecular length, dissolved in the nematic mixture ZLI 1275, have been investigated as a function of frequency and temperature. Low relaxation frequencies have been observed which decrease from 138 kHz to 1.5 kHz at 25°C roughly corresponding to the increase of molecular length. Arrhenius plots show good linear relations with the activation energies being found to increase with decreasing relaxation frequency.