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Interfacial Layer - A New Mechanism for Electromechanical Response

Published online by Cambridge University Press:  01 February 2011

Zhimin Li and
Z.-Y. Cheng
Zhimin Li
Affiliation:
Materials Engineering, Auburn University, Auburn, AL 36849, USA
Z.-Y. Cheng
Affiliation:
Materials Engineering, Auburn University, Auburn, AL 36849, USA
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Abstract

Electric field induced phase transition has been used to explain the high strain response in some PVDF-based EAP. However, it is hard to understand some features (such as the relationship between the strain and the preload) of elastomers - an important type of EAPs. In this paper, we reported the study of recrystallization on high-energy-electron irradiated P(VDF-TrFE) copolymer. The morphology and structure as well as the structural transformation in the recrystallized copolymers were studied by means of X-ray diffraction, DSC, FTIR, and polarization measurements. The effect of crosslinking induced by the irradiation is discussed. The results suggest that a new interface layer existed in the recrystallized polymers. The partially ordered interfacial layer is a novel micro-origin of a high polarization obtained in an EAP. Based on this concept, the effect of preload on the E-M performance of the elastomers can be well explained. A new method to develop high performance electroactive polymer is outlined by using the interface state.

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References

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