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Journal of Thermal Analysis and Calorimetry

, Volume 82, Issue 2, pp 519–523 | Cite as

Thermal analysis and X-ray studies of chiral ferroelectric liquid crystalline materials and their binary mixtures

  • Dusanka Ž. Obadović
  • Anikó Vajda
  • Maya Garić
  • A. Bubnov
  • Vera Hamplová
  • M. Kašpar
  • Katalin Fodor-Csorba
Article

Summary

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.

X-ray diffraction phase transition DSC ferroelectric liquid crystal intermolecular distance layer spacing 

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Copyright information

© Springer-Verlag/Akadémiai Kiadó 2005

Authors and Affiliations

  • Dusanka Ž. Obadović
    • 1
  • Anikó Vajda
    • 2
  • Maya Garić
    • 3
  • A. Bubnov
    • 4
  • Vera Hamplová
    • 5
  • M. Kašpar
    • 6
  • Katalin Fodor-Csorba
    • 7
  1. 1.Department of Physics, Faculty of Sciences, University of Novi Sad
  2. 2.Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences
  3. 3.Department of Physics, Faculty of Sciences, University of Novi Sad
  4. 4.Institute of Physics, Academy of Sciences of the Czech Republic
  5. 5.Institute of Physics, Academy of Sciences of the Czech Republic
  6. 6.Institute of Physics, Academy of Sciences of the Czech Republic
  7. 7.Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences

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