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- Title
Thermal analysis and X-ray studies of chiral ferroelectric liquid crystalline materials and their binary mixtures.
- Authors
Obadović, Dusanka Ž.; Vajda, Anikó; Garić, Maya; Bubnov, A.; Hamplová, Vera; Kašpar, M.; Fodor-Csorba, Katalin
- Abstract
Thermal properties of a homologous series of ferroelectric liquid crystals S-(-)-[4-(2- n-alkoxy-propionyloxy)]biphenyl-4'-[ n-alkoxy-(3,5-dimethyl)]benzoate have been investigated by polarizing optical microscopy and differential scanning calorimetry. The mesophases were identified and confirmed by X-ray too. Three binary mixtures were prepared from the individual homologues. In one of the mixtures (Mix1), the ferroelectric SmC* phase has broadened and became enantiotropic. This mesophase remained monotropic in the other two mixtures (Mix2, Mix3). The chiral nematic N* phase did not appear in Mix1, but remained monotropic for the other two mixtures. Two molecular parameters, the layer spacing and the average intermolecular distance have been calculated from the X-ray results for the homologues and their mixtures. An intercalated tail-to-tail packing of molecules was found both in the single compounds and their mixtures resulting in the layer spacing about half of the molecular length of the single compounds.
- Subjects
LIQUID crystals; FERROELECTRICITY; ELECTRIC properties of crystals; THERMAL properties of crystals; X-rays
- Publication
Journal of Thermal Analysis & Calorimetry, 2005, Vol 82, Issue 2, p519
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-005-0926-9