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Dielectric, TSC and Electromechanical Measurements on some Prospective NLO Polymers

Published online by Cambridge University Press:  21 February 2011

Paul L. Carr ,
Geoff R. Davies  and
Ian M. Ward
Paul L. Carr
Affiliation:
Physics Department, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
Geoff R. Davies
Affiliation:
Physics Department, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
Ian M. Ward
Affiliation:
Physics Department, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
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Abstract

The pyroelectric coefficients of a range of polymers with a methacrylate backbone and nitrostilbene or nitrobipheny mesogens attached by a 3 or 6 carbon spacer have been measured in order to assess the efficiency of the poling process. It is found that the response is much lower than the guest-host system MNA in PMMA, suggesting that the polar mesogens pack anti-parallel and that this alignment is not broken by the applied field.

These strong interactions also provide an explanation for the absence of the β relaxation process in the experimental polymers and therefore the brittle nature of the films. They may also explain the stability of the polarisation achieved.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 175: Symposium S – Multifunctional Materials , 1989 , 289
Copyright
Copyright © Materials Research Society 1990

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