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Analysis of Ferroelectric Switching Process in VDF/Trfe Copolymers

Published online by Cambridge University Press:  10 February 2011

Kenji Kano ,
Hidekazu Kodama ,
Yoshiyuki Takahashi  and
Takeo Furukawa
Kenji Kano
Affiliation:
Department of Chemistry, Faculty of Science, Science University of Tokyo, 1–3 Kagurazaka, Shinjuku, Tokyo, 162–8601 Japan, [email protected]
Hidekazu Kodama
Affiliation:
Department of Chemistry, Faculty of Science, Science University of Tokyo, 1–3 Kagurazaka, Shinjuku, Tokyo, 162–8601 Japan, [email protected]
Yoshiyuki Takahashi
Affiliation:
Department of Chemistry, Faculty of Science, Science University of Tokyo, 1–3 Kagurazaka, Shinjuku, Tokyo, 162–8601 Japan, [email protected]
Takeo Furukawa
Affiliation:
Department of Chemistry, Faculty of Science, Science University of Tokyo, 1–3 Kagurazaka, Shinjuku, Tokyo, 162–8601 Japan, [email protected]
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Abstract

The ferroelectric switching curve of vinylidene fluoride / trifluoroethylene copolymer exhibits a characteristic time evolution consisting of two processes; an initial gradual increase in proportion to t 0 5 followed by a rapid increase according to an exponential function with particularly large exponent 6. Such a switching curve was analyzed by means of computer simulation based on a modified nucleation-growth mechanism. It was found that the initial gradual increase is attributed to generation of considerably large nuclei that grow according to a random-walk scheme. Once such nuclei gain a critical size, they start to grow automatically either one or two dimensionally. The time required to generate critical nuclei serves as an incubation time for the later growth process to result in the large exponent.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 600: Symposium FF – Electroactive Polymers , 1999 , 89
Copyright
Copyright © Materials Research Society 2000

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