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A new series of siloxane liquid crystalline dimers exhibiting the antiferroelectric phase

Journal article
Authors Nils Olsson
Bertil Helgee
Gunnar Andersson
Lachezar Komitov
Published in Liquid Crystals
Volume 32
Issue 9
Pages 1139-1150
ISSN 0267-8292
Publication year 2005
Published at Department of Physics (GU)
Pages 1139-1150
Language en
Keywords siloxane, liquid crystals, dimers, antiferroelectric, ferroelectric, tilt angle
Subject categories Polymer Chemistry, Organic synthesis, Optics

Abstract

In this paper, we report the study of a new series of symmetric chiral liquid crystalline siloxane dimers, their related monomers, and two of those monomers with heptamethyltrisiloxane attached. All the dimers coupled with a trisiloxane show the SmCA phase, which in several cases has a large tilt angle greater than 40° over a wide temperature range, as well as high spontaneous polarisation in the field-induced ferroelectric state. Spacer lengths of 3-6 and 11 carbons between the siloxane central unit and the mesogenic cores were used. Monomers with 3-6 carbons in the spacer showed only orthogonal phases while the monomer with an 11-carbon spacer, as well as the monomers with siloxane attached, have a high tilt angle ferroelectric phase. The materials were characterized by means of DSC, NMR, X-ray diffraction, electro-optical methods (tilt angle and texture characterization) and polarization measurements.

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