Bi-mesogenic organosiloxane liquid crystal materials exhibiting antiferroelectric phases

W. K. Robinson, P. S. Kloess, C. Carboni, H. J. Coles

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Abstract

The first antiferroelectric low molar mass organosiloxane liquid crystal materials are presented. The molecules are bi-mesogens consisting of two chiral mesogenic units attached, via methylene spacers, symmetrically to a siloxane group. Three series of compounds with different laterally substituted halogens on the phenyl ring nearest to the chiral centre have been studied. For siloxane groups containing three silicon atoms all of the materials exhibit antiferroelectric phases over a 60°C temperature range. The tilt angle in the SmCA* is, within experimental uncertainties, independent of temperature and close to 45 degrees for the three series with a spontaneous polarization greater than 110nCcm-2.

Original languageEnglish
Pages (from-to)309-312
Number of pages4
JournalLiquid Crystals
Volume23
Issue number2
Publication statusPublished - Aug 1997

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ASJC Scopus subject areas

  • Condensed Matter Physics

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