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Proceedings Paper

Broadband dielectric spectroscopy on ferroelectric liquid crystalline polymers
Author(s): A. Schoenfeld; Friedrich Kremer; H. Poths; Rudolf Zentel
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Paper Abstract

The collective and molecular dynamics of ferroelectric liquid crystalline side group polysiloxanes has been investigated for use of broadband dielectric spectroscopy (10-2 Hz - 109 Hz). In the lower frequency range (< 106 Hz) two collective relaxations, Goldstone- and soft-mode, could be observed. They are assigned to the fluctuations of the phase and the amplitude of the helical superstructure, respectively. In the high frequency regime (106 Hz - 109 Hz) one dielectric relaxation, the (beta) - relaxation, is found. It is assigned to the hindered rotation (libration) of the mesogene around its long molecular axis. It shows an Arrhenius-like temperature dependence with no deviations at the phase transition SA/S*C. A dilution of the mesogenes causes a decrease of the collectivity but remains the local dynamics uninfluenced.

Paper Details

Date Published: 4 April 1994
PDF: 11 pages
Proc. SPIE 2175, Liquid Crystal Materials, Devices, and Applications III, (4 April 1994); doi: 10.1117/12.172128
Show Author Affiliations
A. Schoenfeld, Max-Planck-Institut fuer Polymerforschung (Germany)
Friedrich Kremer, Max-Planck-Institut fuer Polymerforschung (Germany)
H. Poths, Univ. Mainz (Germany)
Rudolf Zentel, Univ. Mainz (Germany)

Published in SPIE Proceedings Vol. 2175:
Liquid Crystal Materials, Devices, and Applications III
Ranganathan Shashidhar, Editor(s)

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