Authors : Khalid Al. Ammar and Lina Abd Oun Al-Jamal
Abstract: In this study, research the effect of ferroelectric nanoparticles (Sn2P2S6) on electro-optical properties of liquid crystalline polymer (consisting of a polymer polysiloxane with a side chain). Using five different molecular weights of molecular weight ranging from (1.7H106-3.1H103) and the percentage of material nanoparticles Sn2P2S6 added equal to all molecular weights, it has been noted that the voltages increase with increasing molecular weight and when less the value of the intensity we get the operating voltage. Measured the optic response times (τon) when current is switched on (under the electric field) and has also been measured when the electric current is switched off (τ0ff) (the electrical field is removed) by calculating the time period between two stages under the effect of the electrical field. The performance of the electro optical cells has improved after add the ferroelectric nanoparticles (Sn2P2S6) would reduce the contribution of the dipole moment of the cyano-group parallel to the molecular long axis of the mesogeic unit. The density of mesognic unit the few on polymer chaine and lead to a increases of dielectric anisotropic Δε and therefore, improved backbone mobility for the system. The variation of the threshold voltage is measure at constant ladders below (nematic-isotropic) transition temperature TIN for series of polymers.
Khalid Al. Ammar and Lina Abd Oun Al-Jamal, 2018. Influence of Ferroelectric Nanoparticles on Liquid Crystal Polymer Nanocomposites and Studying their Electro-Optic Response. Journal of Engineering and Applied Sciences, 13: 10232-10237.