Abstract
Pretransitional phenomena were characterized for low molecular weight liquid crystals as well as for a mesogenic side chain polymer by means of electric briefringence studies. The magnitude of the induced birefringence was found to diverge in the isotropic phase as a hypothetical second order phase transition into the nematic phase is approached.
This behaviour also holds for the relaxation time of correlated “mesogenic groups” in the case of the polymeric sample. The results are interpreted in terms of the Landau-de Gennes theory of the nematic-isotropic phase transition. Additionally, an example of an isotropic-smectic phase transition is given, where no critical fluctuations of the nematic order parameter occur.
Lecture given at the 31th Conference of the Kolloid Gesellschaft, Bayreuth October 11–14, 1983.
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Abbreviations
- MBBA:
-
Methoxybenzylidene butyl aniline
- PET:
-
Polyethylene terephthalate
- PHB:
-
p-hydroxy-benzoesäure
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© 1984 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG
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Eich, M., Ullrich, K., Wendorff, J.H. (1984). Investigations on pretransitional phenomena of the isotropic-nematic phase transition of mesogenic materials by means of electrically induced briefringence. In: Weiss, A. (eds) Surfactants, Micelles, Microemulsions and Liquid Crystals. Progress in Colloid & Polymer Science, vol 69. Steinkopff. https://doi.org/10.1007/BFb0114968
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DOI: https://doi.org/10.1007/BFb0114968
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