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Evolution of Property and Microstructure of P(VDF-TrFE) Copolymers Modified by Irradiation Introduced Defects

Published online by Cambridge University Press:  11 February 2011

Z.-Y. Cheng ,
Zhimin Li ,
Yanyun Ma ,
Q. M. Zhang  and
Fred B. Bateman
Z.-Y. Cheng*
Affiliation:
Materials Research and Education Center, Auburn University, Auburn, AL 36849
Zhimin Li
Affiliation:
Materials Research and Education Center, Auburn University, Auburn, AL 36849
Yanyun Ma
Affiliation:
The Pennsylvania State University, Materials Research Institute, University Park, PA 16802
Q. M. Zhang
Affiliation:
The Pennsylvania State University, Materials Research Institute, University Park, PA 16802
Fred B. Bateman
Affiliation:
Radiation Interactions and Dosimetry, NIST, Gaithersburg, MD 20899, U.S.A
*
chengzh@eng.auburn.edu
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Abstract

The effect of defects introduced by high-energy electron irradiation on microstructure and properties in poly(vinylidene fluoride- trifluoroethylene) [P(VDF-TrFE)] is reported. In studies of the copolymers, it is found that as defect concentration increases, the material can be changed from a normal ferroelectrics to a relaxor ferroelectrics (RFE) and then to a simple relaxor. Correspondingly, the crystalline morphology changes from a coexistence of polar and non-polar phases to a macroscopically uniform non- polar phase, as revealed by x -ray data. It was observed that the dielectric property in the copolymers with a different amount of defects was well described by the Vogel-Fulcher (V-F) relationship. Based on the experimental data, a critical size, which is the smallest size of crystal with ferroelectric phase, of about 5 nm was obtained for the copolymer. The RFE developed here exhibits a massive electrostrictive strain which is very attractive for many actuator and transducer applications and a high dielectric constant which is attractive for development of high- density energy storage capacitors and electronic packaging.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 734: Symposia A/B – Defect-Mediated Phenomena in Ordered Polymers – Polymer/Metal Interfaces and Defect Mediated Phenomena in Ordered Polymers , 2002 , A2.5
Copyright
Copyright © Materials Research Society 2003

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References

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