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Phase transformation of poly (vinylidene difluoride) in energy harvesting

Published online by Cambridge University Press:  12 January 2011

Hong Liang*
Affiliation:
Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123
Rodrigo Cooper
Affiliation:
Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123
Jason Files
Affiliation:
Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The poly (vinylidene difluoride) (PVDF) has been of great interest for energy conversion of microelectromechanical system devices. A semicrystalline polymer, the PVDF has five crystallographic forms, α, β, γ, δ, and ε. The latter four structures exhibit a permanent dipole moment. In this research, we investigated effects of microstructures of the PVDF on its piezoelectricity for energy harvesting. Using various experimental techniques, we observed the power density generated by a mechanical force that was correlated with the phase transformation between amorphous, α, β, and γ phases. The transformation was time-dependent in a nonlinear manner. Such transformation influences the energy transition and storage of small devices.

Type
Invited Feature Paper
Copyright
Copyright © Materials Research Society 2011

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