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Dielectric relaxation in the nematic and smectic A phases of nPCHB-NCS homologous series

Dielectric relaxation studies are reported of several substances belonging to the homologous series of 4-isothiocyanatophenyl 4-(trans-4-alkylcyclohexyl) benzoates (nPCHB-NCS) which exhibit the nematic (N) and smectic A(SmA) polymorphism. From the relaxation times (tau) (parallel) characterizing molecular reorientations around the short axes the activation enthalpies (Delta) H(parallel) for both phases were calculated. It was found that (Delta) H(parallel)(N) is markedly larger than (Delta) H(parallel)(SmA). The effect is interpreted on the basis of existing models of smectic A phase.