Enhancement of thermal, dielectric and electro-optical properties of fluoro hydrogen-bonded liquid crystals
Bassem Meddeb, Ahlem Gesmi, Naoufel Ben Hamadi, Taoufik Soltani
Abstract
The present work reported the synthesis and the characterisation of laterally fluorinated handed bond liquid crystals (HBLCs) prepared by intermolecular hydrogen bonds between 4-pentyl-4-biphenylcarbonitrile (5CB) and 4-(nonyloxy)-3-fluoro benzoic acid (9OBAF). This compound-denoted 9OBAF-5CB was characterised by Fourier transform infrared spectroscopy (FTIR) and their mesomorphic properties were studied by polarising optical microscope (POM) and differential scanning calorimetry (DSC). Moreover, this compound shows a wide nematic phase with relatively high birefringence (Δn = 0.24, modest dielectric anisotropy Δε = 5, low viscosity (γ = 182.9 mPas). The enhancement of these parameters compared to that in individual compounds (9OBAF) and 5CB was obtained and discussed.