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Proceedings Paper

Broad-band dielectric spectroscopy on liquid crystalline polymethacrylates with a nitrostilbene mesogene in the side chain
Author(s): Matthias Pfeiffer; Wolfgang Haase
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Paper Abstract

Using the dielectric spectroscopy in the frequency range I Hz to iO Hz the dielectric response of a suitable characterized (DSC, polarizing microscopy, X-ray diffraction) oriented film of a poly-[4-(4- Methacryloyloxybutoxy)-4'-nitrostilbene] could be detected. The relaxation in parallel alignment is interpreted as a s-process equivalent to the molecular reorientation process around the mesogen's short axis. The perpendicular alignment allows to detect dipole relaxation processes resulting from motions around the mesogen's long axis. A perfect alignment could be obtained in a strong magnetic field of 7 T. Using this method an oligomer with a molar weight of 2900 g/mol showed a completely transparent film of 75 tm thickness. The problems of chemical synthesis as well as a model for a molecular association are discussed.

Paper Details

Date Published: 1 December 1990
PDF: 12 pages
Proc. SPIE 1337, Nonlinear Optical Properties of Organic Materials III, (1 December 1990); doi: 10.1117/12.22948
Show Author Affiliations
Matthias Pfeiffer, Technische Hochschule Darmstadt (Germany)
Wolfgang Haase, Technische Hochschule Darmstadt (Germany)

Published in SPIE Proceedings Vol. 1337:
Nonlinear Optical Properties of Organic Materials III
Garo Khanarian, Editor(s)

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