Fast switching ferroelectric side-chain liquid-crystalline polymer and copolymer

J. Naciri Center for Bio/Molecular Science and Engineering, Code 6090, Naval Research Laboratory, Washington, D.C., 20375-5000, U.S.A.

S. Pfeiffer Center for Bio/Molecular Science and Engineering, Code 6090, Naval Research Laboratory, Washington, D.C., 20375-5000, U.S.A.; Department of Chemistry, Georgetown University, Washington, D.C., 20057, U.S.A.

R. Shashidhar Center for Bio/Molecular Science and Engineering, Code 6090, Naval Research Laboratory, Washington, D.C., 20375-5000, U.S.A.; Also at Geo-Centers, Inc., 10904 Indian Head Highway, Fort Washington, MD20744, U.S.A.

Abstract

New ferroelectric side-chain liquid-crystalline polymers, a copolymer and a homopolymer, with siloxane backbone and a triaromatic mesogen as the side group have been synthesized. The materials exhibit a chiral smectic C phase over a large temperature range extending to room temperature. They possess high values of spontaneous polarization: 105 nC cm⁻² for the homopolymer and 180 nC cm⁻² for the copolymer. The electro-optic switching time in the chiral smectic C phase is extremely fast (150 μs). In the smectic A phase, an electroclinic effect with switching times less than 100 μs and with field induced tilt angles of 18° is observed.

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Fast switching ferroelectric side-chain liquid-crystalline polymer and copolymer

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Fast switching ferroelectric side-chain liquid-crystalline polymer and copolymer

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