Tuning of Thermal and Electrical Properties of Polymer Dispersed Cholesteric Liquid Crystal

Abstract

When a pure liquid crystal is dispersed into a suitable polymer to form micron-sized droplet, then it is called Polymer-dispersed liquid crystal (PDLC). In the present study, PDLC of different concentrations were prepared by dispersing a conducting polymer poly (3, 4–ethylenedioxy thiophene): poly (styrene sulfonate) into a cholestryl palmitate. The differential scanning calorimetry and fabry perot scattering studies were employed to study thermal and optical properties. It was found that the phase transition for PDLC occurs at a temperature different than those exhibited by pure liquid crystal. The behaviour of PDLC for parallel and perpendicular electric field has been investigated and the dielectric constant is determined. The value of dielectric constant and conductivity were found to increase with increasing concentration of polymer. The bistability and reflective properties of pure cholesteric liquid crystal can be minimized by dispersing polymer which makes material suitable for high contrast at large viewing angles.

Effect of Electrical Poling on the Structural, Dielectric, and Photoluminescence Properties of Eu³⁺ Substituted Eco-Friendly Ferroelectric Material Na_0.5Bi_0.5TiO₃

“…Substitution of Eu 3+ at the A-site of the NBT adds extra ion at the A-site, which enhances degree disorder and compositional fluctuation and randomness in the distribution of Eu 3+ , Bi 3+, and Na 1+ at the A-site. Thus, enhanced broadness at Tm due to Eu 3+ substitution manifests that chemical-induced DPT type relaxor nature in the ceramic [11][12][13]. To illustrate the electromechanical coefficient (kp), room temperature εˈ vs frequency plot is measured for poled ceramics in the range of 20 Hz to 10 6 Hz.…”

Investigation of Dielectric Spectroscopy of Tellurium (Te) doped Bismuth Antimony (BiSb) pellet

“…Santosh Mani et.al. [21] prepared Polymer Dispersed Liquid Crystals (PDLC) and studied thermal and electrical properties by using differential scanning calorimetry and fabry perot scattering technique. They determined dielectric constant and conductivity of the material.…”