Thermal Behaviour and Mesophase Structure of Cyclic Oligosiloxanes With Chiral Mesogenic Groups

Chiral, smectogenic pendant groups have been covalently attached to cyclic oligosiloxanes by hydrosilylation. Differential scanning calorimetry, optical polarising microscopy, and X-ray diffraction measurements reveal liquid crystalline properties for all synthesized monomers and oligomers. The mono...

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Bibliographic Details
Published in:Molecular crystals and liquid crystals (Philadelphia, Pa. : 2003) Pa. : 2003), 2004-01, Vol.411 (1), p.217-230
Main Authors: Sołtysiak, Joanna, Białecka-Florjańczyk, Ewa, Kowalczyk, Ewa, Przedmojski, Jan
Format: Article
Language:English
Subjects:
Cyclic Oligosiloxanes
Liquid Crystals
Smectic Mesophase
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Summary:Chiral, smectogenic pendant groups have been covalently attached to cyclic oligosiloxanes by hydrosilylation. Differential scanning calorimetry, optical polarising microscopy, and X-ray diffraction measurements reveal liquid crystalline properties for all synthesized monomers and oligomers. The monomers, which differ by the nature of the rigid mesogenic core or end groups, showed enantiotropic smectic A phases. Almost all of cyclic oligosiloxanes present enantiotropic chiral smectic C phases. The mesomorphic range of these oligomers is greatly enhanced relative to the type of monomers and the ring size as well.
ISSN:1542-1406
1563-5287
DOI:10.1080/15421400490435206