Antiferroelectric liquid crystals studied by DSC, electro-optic, and dielectric methods

M. Marzec; A. Fafara; S. Wrobel; Malgorzata Godlewska; Roman S. Dabrowski; Krzysztof L. Czuprynski; Wolfgang Haase

doi:10.1117/12.385664

12 May 2000 Antiferroelectric liquid crystals studied by DSC, electro-optic, and dielectric methods

M. Marzec, A. Fafara, S. Wrobel, Malgorzata Godlewska, Roman S. Dabrowski, Krzysztof L. Czuprynski, Wolfgang Haase

Proceedings Volume 4147, Liquid Crystals: Chemistry, Physics, and Applications; (2000) https://doi.org/10.1117/12.385664
Event: XIII International Conference on Liquid Crystals: Chemistry, Physics, and Applications, 1999, Krynica Zdroj, Poland

Abstract

Thermal properties of four liquid crystalline substances exhibiting antiferroelectric SmC_A* and ferroelectric SmC* phases were studied using differential scanning calorimetry, texture observation, electrooptic measurements and dielectric spectroscopy. The measurements were performed both on heating and cooling of the samples. All four substances studied in this work are characterized by a complex polymorphism. The temperatures of phase transitions and enthalpy changes associated with them were determined. The transition from the liquid crystalline to the crystalline state showed significant hysteresis for all four substances studied. Textures observations and electrooptic measurements were performed using ITO cells having thickness from 6 to 10 micrometers . The measurements of spontaneous polarization were performed by means of reversal current method. Spontaneous polarization was measured for a few frequencies of the triangular voltage applied. Temperature dependencies of spontaneous polarization have been studied as a function of the side chain structure.

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M. Marzec, A. Fafara, S. Wrobel, Malgorzata Godlewska, Roman S. Dabrowski, Krzysztof L. Czuprynski, and Wolfgang Haase "Antiferroelectric liquid crystals studied by DSC, electro-optic, and dielectric methods", Proc. SPIE 4147, Liquid Crystals: Chemistry, Physics, and Applications, (12 May 2000); https://doi.org/10.1117/12.385664

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