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Investigation of Dipolar Relaxation Processes in a Side-Chain Nonlinear Optical Polymer

Published online by Cambridge University Press:  10 February 2011

Z. -Y. Cheng ,
R. S. Katiyar ,
S. Bauer  and
S. Bauer-Gogonea
Z. -Y. Cheng
Affiliation:
Department of Physics, University of Puerto Rico, P. O. Box 23343, San Juan, PR 00931–3343, USA. [email protected]; [email protected]
R. S. Katiyar
Affiliation:
Department of Physics, University of Puerto Rico, P. O. Box 23343, San Juan, PR 00931–3343, USA. [email protected]; [email protected]
S. Bauer
Affiliation:
Institut für Festkörperphysik, Universität Potsdam, Am Neuen Palais 10, D-14469 Potsdam, Germany, [email protected]
S. Bauer-Gogonea
Affiliation:
Heinrich-Hertz-Institut für Nachrichtentechnik Berlin, Einsteinufer 37, D-10587 Berlin, Germany, [email protected]
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Abstract

Amorphous thin films of a typical side-chain nonlinear optical polymer were investigated by means of dielectric spectroscopy and thermally stimulated depolarization current (TSDC) within the temperature range -40°C to 230°C. Three distinct relaxation processes, labelled α, β and γ were observed. The α-relaxation, associated with the glass transition, is well described by the Vogel-Fulcher relation, while the sub glass transition β and γ-relaxation follow Arrhenius relations. The advantage of TSDC over dielectric spectroscopy is demonstrated for the investigation of the weak β-relaxation in the side-chain polymer. Furthermore, the β -relaxation is responsible for the initial, fast decay of the electro-optical response of the side-chain polymer at room temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 446: Amorphous and Crystalline Insulating Thin Films–1996 , 1996 , 97
Copyright
Copyright © Materials Research Society 1997

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