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Proceedings Paper

Smectic liquid crystals modified by tail and core fluorination
Author(s): Robert J. Twieg; K. M. Betterton; Richard C. DiPietro; D. Gravert; Cattien V. Nguyen; H. T. Nguyen; A. Babeau; C. Destrade
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Paper Abstract

The systematic substitution of fluorine for hydrogen in mesogenic materials has proved to be of great value for the modification of a wide range of physical properties. This is especially true in the case of ferroelectric liquid crystals in which the fluorine has been strategically introduced into the aromatic core (k), at or near the chiral center (Z) or in the achiral tail (n) in the generic liquid crystal (with X equals O, S and Z equals Me, halogen): H/F(CF2)n(CH2)mOC6H(4 - k)FkCOXPhOCOC*HZR. In this system the fluorine can be introduced in any of these three specific locations, or any combinations thereof, with the intent of enhancing performance such as broadening of the ferroelectric Sc* phase temperature range, enhancement of the magnitude of spontaneous polarization Ps and a variety of more subtle yet important modifications such as viscosity and dielectric and optical anisotropy. The ramifications of the incorporation of fluorine on these physical properties are discussed with a variety of examples.

Paper Details

Date Published: 1 June 1991
PDF: 11 pages
Proc. SPIE 1455, Liquid-Crystal Devices and Materials, (1 June 1991); doi: 10.1117/12.44683
Show Author Affiliations
Robert J. Twieg, IBM/Almaden Research Ctr. (United States)
K. M. Betterton, IBM/Almaden Research Ctr. (United States)
Richard C. DiPietro, IBM/Almaden Research Ctr. (United States)
D. Gravert, IBM/Almaden Research Ctr. (United States)
Cattien V. Nguyen, IBM/Almaden Research Ctr. (United States)
H. T. Nguyen, Ctr. de Recherche Paul Pascal (France)
A. Babeau, Ctr. de Recherche Paul Pascal (France)
C. Destrade, Ctr. de Recherche Paul Pascal (France)

Published in SPIE Proceedings Vol. 1455:
Liquid-Crystal Devices and Materials
Paul S. Drzaic; Uzi Efron, Editor(s)

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