Broadband dielectric spectroscopy on ferroelectric liquid crystalline polymers

A. Schoenfeld; Friedrich Kremer; H. Poths; Rudolf Zentel

doi:10.1117/12.172128

4 April 1994 Broadband dielectric spectroscopy on ferroelectric liquid crystalline polymers

A. Schoenfeld, Friedrich Kremer, H. Poths, Rudolf Zentel

Proceedings Volume 2175, Liquid Crystal Materials, Devices, and Applications III; (1994) https://doi.org/10.1117/12.172128
Event: IS&T/SPIE 1994 International Symposium on Electronic Imaging: Science and Technology, 1994, San Jose, CA, United States

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 S_A/S^*_C. A dilution of the mesogenes causes a decrease of the collectivity but remains the local dynamics uninfluenced.

Citation Download Citation

A. Schoenfeld, Friedrich Kremer, H. Poths, and Rudolf Zentel "Broadband dielectric spectroscopy on ferroelectric liquid crystalline polymers", Proc. SPIE 2175, Liquid Crystal Materials, Devices, and Applications III, (4 April 1994); https://doi.org/10.1117/12.172128

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