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Giant Electrocaloric Effect in High-Energy Electron Irradiated P(VDF-TrFE) Copolymers

Published online by Cambridge University Press:  25 March 2011

S. G. Lu ,
X. Y. Li ,
J. P. Cheng ,
L. Gorny  and
Q. M. Zhang
S. G. Lu*
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA
X. Y. Li
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA
J. P. Cheng
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA
L. Gorny
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA
Q. M. Zhang
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA
*
*Contact person: sul26@psu.edu. Phone: 814-863-1006; Fax: 814-863-7846.
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Abstract

A direct calorimetry method was developed and used to measure the electrocaloric effect (ECE). A temperature change ΔT of over 20 °C and an entropy change ΔS of over 95 J/(kgK) were procured at 33 °C and 160 MV/m in the high-energy electron irradiated poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) 68/32 mol% copolymers, which were larger than those of terpolymer blends (ΔT = 9 °C, ΔS=46 J/(kgK) at 180 MV/m and room temperature) and our earlier report on P(VDF-TrFE) 55/45 mol% normal ferroelectric copolymer (12 °C and 55 J/(kgK) at 80 °C). We observed that the β value ((8.7±0.6)×107 JmC-2K-1) in the equation of ΔS=1/2βΔD2 derived from ΔS - ΔD2 relation for irradiated copolymers was larger than that of the terpolymer blends ((5.4±0.5)×107 JmC-2K-1). It was also found that the irradiated copolymer showed a sharp depolarization peak at Td < Tm (maximum permittivity temperature), which is frequency independent, in the dielectric constant - temperature characteristics, a larger depolarization value at Td in the thermally stimulated depolarization current (TSDC) - temperature relationship, and a larger volume strain/longitudinal strain ratio over terpolymer blends. The giant ECE in irradiated copolymer is regarded as due to the greater randomness present in the relaxor state. In irradiated copolymers, the long all-trans chains are broken by the high-energy electrons, which make the small sized all-trans sequences more easily reorient along the electric field, more remarkably affecting the permittivity, TSDC, and volume strain.

Keywords

dielectric propertiespolymerphase transformation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1310: Symposium FF – Magnetocalorics and Magnetic Cooling , 2011 , mrsf10-1310-ff03-21
Copyright
Copyright © Materials Research Society 2011

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References

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