Nematic–smectic-C phase transition in the polymeric liquid crystal C-6 
polysiloxane: A high resolution x-ray study

Nachaliel, Ehud; Keller, Edward N.; Davidov, Dan; Zimmermann, Herbert; Deutsch, Moshe

doi:10.1103/PhysRevLett.58.896

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Nematic–smectic-C phase transition in the polymeric liquid crystal C-6 polysiloxane: A high resolution x-ray study

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Zimmermann, Herbert
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;
Zimmermann Group, Max Planck Institute for Medical Research, Max Planck Society;
Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Nachaliel, E., Keller, E. N., Davidov, D., Zimmermann, H., & Deutsch, M. (1987). Nematic–smectic-C phase transition in the polymeric liquid crystal C-6 polysiloxane: A high resolution x-ray study. Physical Review Letters, 58(9), 896-899. doi:10.1103/PhysRevLett.58.896.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-AE7F-6

Abstract

We report on the first x-ray scattering measurements of pretransitional smectic-C fluctuations in the nematic phase of a side-chain polymeric liquid crystal, C-6 polysiloxane. The data are well described by the mean-field theory of Chen and Lubensky suggesting that the mesogenic side groups are only weakly coupled to the polymeric backbone. Because of disorder in the polymer backbone, the correlation lengths, in the vicinity of the nematic-smectic-C phase transition, are weak functions of temperature and their magnitudes are smaller than those of conventional monomeric liquid crystals.