Dielectric relaxations in new liquid crystalline diepoxy monomer

M. Wlodarska; B. Mossety-Leszczak; Lidia Okrasa; Grzegorz W. Bak; H. Galina; J. Ulanski

doi:10.1117/12.472169

27 June 2002 Dielectric relaxations in new liquid crystalline diepoxy monomer

M. Wlodarska, B. Mossety-Leszczak, Lidia Okrasa, Grzegorz W. Bak, H. Galina, J. Ulanski

Proceedings Volume 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications; (2002) https://doi.org/10.1117/12.472169
Event: XIV Conference on Liquid Crystals, Chemistry, Physics, and Applications, 2001, Zakopane, Poland

Abstract

A series of new liquid crystalline divinyl and diepoxy monomers of different length of stiff segments, were synthesized. Relaxation phenomena in one of these compounds were investigated at different temperatures using Solartron 1260 Impedance Analyzer with Chelsea Dielectric Interface in the frequency range 10^-2 Hz - 1 MHz. The liquid crystalline material was introduced between two parallel glass plates covered with conducting ITO layer and polyimide thin film with anti-parallel rubbing. The microscope observations have revealed a planar texture in this kind of sample. In order to find the influence of the polyimide thin film on the texture the investigations of a sample with out the polyimide film were also carried out. In this case the homeotropic structure was detected at zero external electric field. Three loss peaks were detected in the investigated frequency range. The dielectric response is sensitive to the phase transitions observed in this material. The temperatures of the phase transitions determined from the dielectric study are in a reasonable agreement with those obtained from thermo-optical analysis.

Citation Download Citation

M. Wlodarska, B. Mossety-Leszczak, Lidia Okrasa, Grzegorz W. Bak, H. Galina, and J. Ulanski "Dielectric relaxations in new liquid crystalline diepoxy monomer", Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); https://doi.org/10.1117/12.472169

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