Dielectric Properties of 4-Cyano-4′-pentylbiphenyl (5CB): 4-[4-(S)-2-Methylbutoxybenzoyloxy]benzoic Acid (BAC) Composite

Abstract

Dielectric relaxation dynamics properties of 5CB (4-cyano-4′-pentylbiphenyl) and BAC(4-[4-(S)-2-methylbutoxybenzoyloxy]benzoic acid) have been investigated. In this respect, dielectric properties of 5CB plus (1%)BAC have been compared with 5CB. The polarizing microscopy results show that BAC and 5CB exhibit enantiotropic N* mesophase and N mesophase, respectively. The real (ϵ ′) and imaginary components (ϵ′′) of dielectric constant have been calculated by capacitance method. The dielectric relaxation mechanisms of liquid crystals have been analyzed by Cole-Cole plots and the Debye distribution parameters (α) have been calculated. It has been also determined that adding BAC to 5CB increases the voltage dependent dielectric strength.

Keywords:

• 4-[4-(S)-2-Methylbutoxybenzoyloxy]benzoic acid
• 4-cyano-4′-pentylbiphenyl
• absorption coefficient
• dielectric strength
• liquid crystal
• relaxation mechanism

Acknowledgments

This work has been supported by the Scientific and Technological Research Council of Turkey (TUBITAK) with the project number: 111T102 and Yildiz Technical University Scientific Research Projects Coordination Department under Project Number: 2014-01-01-GEP05.