X-ray investigations on some liquid crystalline methacrylic polymers with omega-hexyloxysalicylaldimine side groups carrying p-alkyl or p-alkyloxy terminal substituents
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X-ray diffraction data for four different liquid crystalline side group methacrylic polymers based on the omega-hexyloxysalicylaldimine moiety with p-alkyl or p-alkyloxy terminal substituents are presented. For the decyloxy, dodecyloxy and octyl derivatives, a smectic C-2 phase occurs over a broad temperature range, while for the tetradecyl derivative a complex behaviour was observed on cooling from the isotropic state. In this last case a smectic A(d) phase arises, changing to a smectic C-2 phase and a further smectic C-d phase. A possible explanation for the observed phenomena is presented.