Low-frequency dielectric relaxation in liquid crystal-polymer composites

L. Dolgov; Oleg V. Yaroshchuk; A. V. Koval'chuk; Diederik S. Wiersma

doi:10.1117/12.569819

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20 July 2004 Low-frequency dielectric relaxation in liquid crystal-polymer composites

L. Dolgov, Oleg V. Yaroshchuk, A. V. Koval'chuk, Diederik S. Wiersma

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Proceedings Volume 5507, XVI International Conference on Spectroscopy of Molecules and Crystals; (2004) https://doi.org/10.1117/12.569819
Event: XVI International Conference on Spectroscopy of Molecules and Crystals, 2003, Sevastopol, Ukraine

Abstract

The dielectric constants ε′ and ε″ of a series of "liquid crystal (LC) - polymer" composites in the frequency region 10^-3-10⁵ Hz are measured. The composites are prepared by a photo-separation method with the variation of polymer content from 0 to 50 weight %. For all samples, a relaxation effect with a low relaxation frequency (10^-1-20 Hz) is observed. This effect is assigned to dielectric relaxation in the near-electrode layers. The experimentally observed increase of the relaxation frequency and the electric conductivity with polymer concentration is explained by incomplete phase separation occurred in "liquid crystal - pre-polymer" mixture under irradiation.

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L. Dolgov, Oleg V. Yaroshchuk, A. V. Koval'chuk, and Diederik S. Wiersma "Low-frequency dielectric relaxation in liquid crystal-polymer composites", Proc. SPIE 5507, XVI International Conference on Spectroscopy of Molecules and Crystals, (20 July 2004); https://doi.org/10.1117/12.569819

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