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Dielectric properties of polymer-dispersed antiferroelectric liquid crystals influenced by flexoelectric polarization

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Abstract

Dielectric spectrum of polymer-dispersed antiferroelectric liquid crystals (PDAFLC) was studied theoretically by considering the influence of flexoelectric polarization. Such flexoelectric polarization arose due to mechanical distortion as a whole and contributed a direct dependence on the bulk free energy with the free volume interactions, bulk anchoring strength of the in-layer molecular director and polymeric cross-link. The behaviour of both the low-frequency in-phase mode and the high-frequency anti-phase mode depending on the variation of flexoelectric polarization in PDAFLC was studied in detail theoretically. The dielectric permittivity and the dielectric strength were affected strongly because of the co-operative motion of the molecules and the polymeric cross-links for both occasions. The variation of relaxation times and unwinding critical field of both phases with the variation of flexoelectric polarization and interlayer interaction strength was studied in detail.

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  1. Department of Physics, Kalyani University, Kalyani, West Bengal, 741235, India

    Tapas Pal Majumder

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Pal Majumder, T. Dielectric properties of polymer-dispersed antiferroelectric liquid crystals influenced by flexoelectric polarization. Polym. Bull. 80, 621–642 (2023). https://doi.org/10.1007/s00289-021-04024-x

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