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Comparative study of dielectric and electro-optical properties of pure and polymer ferroelectric liquid crystal composites

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Abstract

The ferroelectric liquid crystals (FLCs) displays normally suffer from less contrast ratio and vision angle. To produce high optical contrast and colors in FLC displays, Guest-host mode is widely used. Addition of a small amount of polymer in the pure FLC results in considerable change in its dielectric and electro-optical properties. In the present paper we have investigated the effect of adding polymer (PMMA) on the FLC material (Felix 17/100). Polymer doped FLC composites (FLCPC) has been prepared by the dispersion of 1% wt/wt concentration of polymer in pure FLC. Planar aligned cells have been used to study dielectric and electro-optical properties in SmC* phase of both the samples i.e. pure FLC and FLCPC. Considerable change in various properties like spontaneous polarization, anchoring parameters, Goldstone mode relaxation time and relaxation strength have been noticed for both the samples. These changes have been explained by considering polymer network formed in the FLC matrix.

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Acknowledgement

One of the authors (AKM) is thankful to UGC, New Delhi for the grant of Dr. D.S. Kothari Post Doctoral Fellowship No.F.4.2/2006 (BSR)-13-234/2008(BSR). The authors are sincerely thankful to DST, New Delhi for the financial assistance in the form of project, UGC for the grant of funds in form of project and SAP for the present work.

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Authors and Affiliations

  1. Liquid Crystal Research Laboratory, Department of Physics, University of Lucknow, Lucknow, 226007, UP, India

    Rajiv Manohar, Satya P. Yadav, Kamal K. Pandey, Abhishek Kr Srivastava & Abhishek Kr Misra

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  1. Rajiv Manohar
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  2. Satya P. Yadav
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  3. Kamal K. Pandey
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  4. Abhishek Kr Srivastava
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  5. Abhishek Kr Misra
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Correspondence to Rajiv Manohar.

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Manohar, R., Yadav, S.P., Pandey, K.K. et al. Comparative study of dielectric and electro-optical properties of pure and polymer ferroelectric liquid crystal composites. J Polym Res 18, 435–441 (2011). https://doi.org/10.1007/s10965-010-9434-0

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  • DOI: https://doi.org/10.1007/s10965-010-9434-0

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