Citation: Ian Mann, Xinfei Yu, Wen-Bin Zhang, Ryan M. Van Horn, Jason J. Ge, Matthew J. Graham, Frank W. Harris, Stephen Z.D. Cheng. Time and Poling History Dependent Energy Storage and Discharge Behaviors in Poly(vinylidene fluoride-CO-hexafluoropropylene) Random Copolymers[J]. Chinese Journal of Polymer Science, ;2011, 29(1): 65-80. doi: 10.1007/s10118-010-1020-8 shu

Time and Poling History Dependent Energy Storage and Discharge Behaviors in Poly(vinylidene fluoride-CO-hexafluoropropylene) Random Copolymers

Received Date: 24 August 2010
Revised Date: 2 September 2010

We studied cycle time (0.0110 s with triangular input waves) and poling history (continuous versus fresh poling) dependent electric energy storage and discharge behaviors in poly(vinylidene fluoride-co-hexafluoropropylene) [P(VDF-HFP)] films using the electric displacement ― the electric field (D-E) hysteresis loop measurements. Since the permanent dipoles in PVDF are orientational in nature, it is generally considered that both charging and discharging processes should be time and poling history dependent. Intriguingly, our experimental results showed that the charging process depended heavily on the cycle time and the prior poling history, and thus the D-E hysteresis loops had different shapes accordingly. However, the discharged energy density did not change no matter how the D-E loop shape varied due to different measurements. This experimental result could be explained in terms of reversible and irreversible polarizations. The reversible polarization could be charged and discharged fairly quickly ( 5 ms for each process), while the irreversible polarization depended heavily on the poling time and the prior poling history. This study suggests that it is only meaningful to compare the discharged energy density for PVDF and its copolymer films when different cycle times and poling histories are used.
- P(VDF-HFP) random copolymer,
- Charging and discharging behaviors,
- Time and poling history dependence,
- Dipole switching,
- Compensation polarization
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