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Broad Temperature Range Of Chiral Smectic C Phase In Some Ferroelectric Side-Chain Liquid Crystalline Polysiloxanes Containing Oligooxyethylene Spacers

Published online by Cambridge University Press:  16 February 2011

G. H. Hsiue ,
J. H. Chen  and
C. S. Hsu
G. H. Hsiue
Affiliation:
Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 300, R.O.C.
J. H. Chen
Affiliation:
Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 300, R.O.C.
C. S. Hsu
Affiliation:
Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan 300, R.O.C.
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Abstract

The Mesomorphic behaviors of some ferroelectric liquid crystalline monomers and side-chain polysiloxanes studied by X-ray diffraction Measurement, differential scanning calorimeter and polarizing Microscope. All obtained polymers exhibit wide temperature range of chiral smectic C phase including room temperature.

These Mesogenic structures contain oligooxyethylene spacers and (S)-2-Methyl-l -butyl chiral tail via a three phenyl ester linkage (i.e. -Ph-COO-Ph-Ph- or -Ph-Ph-COO-Ph-). Two series of monomers with different biphenyl group linkage position were compared. One shows a novel twisted smectic A phase, in addition to the liquid crystalline sequence (Ch→SA→Sc*) obtained between cholesteric phase and smectic A phase. It also presents an unusual smectic A and chiral smectic C phase.

All the prepared polymers present smectic Mesomorphism. As the unit of flexible oligooxyethylene spacers increases, the clearing temperature decreases and the stability of the smectic phase also increases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 328: Symposium Q – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1993 , 697
Copyright
Copyright © Materials Research Society 1994

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