Dielectric properties of some bent core liquid crystals

Irina Carlescu1, Aurel Simion1, Adrian Bele2, Petru Marian Carlescu3, Cristina Maria Herghiligiu1, Dan Scutaru1

1 Gheorghe Asachi Technical University of Iasi, Cristofor Simionescu Faculty of Chemical Engineering and Environmental Protection, 73 Prof. dr.docent Dimitrie Mangeron Street, 700050 Iasi, Romania
2 Institute of Macromolecular Chemistry Petru Poni Iasi, Grigore Ghica Voda Street, 41A, 700487 Iasi, Romania
3 Ion Ionescu de la Brad University of Agricultural Sciences and Veterinary Medicine of Iasi, Faculty of Agriculture, 3 Mihail Sadoveanu Alley, 700490 Iasi, Romania

Abstract


Dielectric measurements were carried out on a series of bent-core liquid crystals based on resorcinol and 2, 7-dihydroxinaphtalene cores and presenting B mesophase in between 30-160 C. The dielectric constants in the liquid crystalline phase were measured as a function of frequency and temperature. The dielectric relaxation of bent-core compounds has been analyzed by dielectric constants/frequency curves. The variation of the dielectric strength with temperature has been determined as well. The frequency dependence of dielectric loss has also been analyzed by means of frequency exponent.

Keywords


bent-core liquid crystals; dielectric spectroscopy; molecular reorientation

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