Broad temperature range of chiral smectic C phase in some ferroelectric side-chain liquid crystalline polysiloxanes containing oligooxyethylene spacers

G. H. Hsiue*, J. H. Chen, Chain-Shu Hsu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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-1-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.

Original languageEnglish
Title of host publicationElectrical, Optical, and Magnetic Properties of Organic Solid State Materials
EditorsAnthony F. Garito, Alex K-Y. Jen, Charles Y-C. Lee, Larry R. Dalton
PublisherPubl by Materials Research Society
Pages697-709
Number of pages13
ISBN (Print)1558992278
DOIs
StatePublished - 1 Jan 1994
EventProceedings of the MRS 1993 Fall Meeting - Boston, MA, USA
Duration: 29 Nov 19933 Dec 1993

Publication series

NameMaterials Research Society Symposium Proceedings
Volume328
ISSN (Print)0272-9172

Conference

ConferenceProceedings of the MRS 1993 Fall Meeting
CityBoston, MA, USA
Period29/11/933/12/93

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    Hsiue, G. H., Chen, J. H., & Hsu, C-S. (1994). Broad temperature range of chiral smectic C phase in some ferroelectric side-chain liquid crystalline polysiloxanes containing oligooxyethylene spacers. In A. F. Garito, A. K-Y. Jen, C. Y-C. Lee, & L. R. Dalton (Eds.), Electrical, Optical, and Magnetic Properties of Organic Solid State Materials (pp. 697-709). (Materials Research Society Symposium Proceedings; Vol. 328). Publ by Materials Research Society. https://doi.org/10.1557/PROC-328-697