Evolution of property and microstructure of p(VDF-TrFE) copolymers modified by irradiation introduced defects

Z. Y. Cheng, Zhimin Li, Yanyun Ma, Q. M. Zhang, Fred B. Bateman

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)403-414
Number of pages12
JournalMaterials Research Society Symposium - Proceedings
StatePublished - 2003
EventPolymer/Metal Interfaces and Defect Mediated Phenomena in Ordered Polymers - Boston, MA, United States
Duration: Dec 2 2002Dec 6 2002

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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