Abstract
An antiferroelectric-like polymer approach was proposed for high electric energy storage and low loss performance by using a novel confinement concept. A poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)-graft- polystyrene [P(VDF-TrFE-CTFE)-g-PS] graft copolymer with 14 wt % PS side chains was successfully synthesized. On the basis of the electric displacement-electric field loop study, a novel antiferroelectric-like behavior with extremely low remanent polarization was achieved in this graft copolymer even when the poling field reached as high as 400 MV/m. Compared with a P(VDF-TrFE) random copolymer having the same TrFE content, a similar discharged energy density but a much lower hysteresis loss was observed. This novel antiferroelectric-like behavior at high poling fields was explained by the confinement (or insulation) effect. After crystallization-induced microphase separation, PS side chains were segregated to the periphery of P(VDF-TrFE) crystals, forming a nanoscale interfacial confining (or insulation) layer. Because of the low polarizability of this confining layer, the compensation polarization at the amorphous-crystalline interface was reduced, and thus the local polarization field became weaker than the local depolarization field. Upon discharging, therefore, a fast dipole reversal and an antiferroelectric-like behavior were achieved even at high poling fields. This study will help us design new polar dielectric polymers for high electric energy storage and low loss applications.
Original language | English (US) |
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Pages (from-to) | 2190-2199 |
Number of pages | 10 |
Journal | Macromolecules |
Volume | 44 |
Issue number | 7 |
DOIs | |
State | Published - Apr 12 2011 |
All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry