Ferroelectric and antiferroelectric low molar mass organosiloxane liquid crystals

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)


The present paper is a study of the ferroelectric and antiferroelectric behaviour in low molar mass organosiloxane liquid crystal materials classed as mono-mesogens (AB type) and bi-mesogens (ABA type). A systematic study of series of materials all based on the same chiral mesogenic moiety is presented. The mesogen is a biphenylyl benzoate with a halogen X attached laterally to the benzoate ring which is closest to the chiral centre. Three homologous series, where the halogen is either fluorine, chlorine or bromine, are investigated. The number of silicon atoms in the linkage or end group is varied between two and nine. It is found that the materials have a broad (∼40°C) ferroelectric or antiferroelectric phase with a high Ps (∼90nCcm-2). The siloxane moiety forces the tilt angle to a temperature independent value close to 45°. The antiferroelectric order is observed only in bi-mesogens with an odd number of silicon atoms in the siloxane link. The antiferroelectric order is attributed to the conformation of the molecule rather than to antiferroelectric interactions between layers.

Original languageEnglish
Pages (from-to)301-307
Number of pages7
JournalLiquid Crystals
Issue number3
Publication statusPublished - Sep 1998

ASJC Scopus subject areas

  • Condensed Matter Physics


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