Abstract
Dielectric polymer film capacitors having high energy density, low loss and fast discharge speed are highly desirable for compact and reliable electrical power systems. In this work, we study the confined ferroelectric properties in a series of poly(vinylidene fluoride-co-chlorotrifluoroethylene)-graft- polystyrene [P(VDF-CTFE)-g-PS] graft copolymers, and their potential application as high energy density and low loss capacitor films. Thin films (ca. 20 μm) are prepared by different processing methods, namely, hot-pressing or solution-casting followed by mechanical stretching at elevated temperatures. After crystallization-induced microphase separation, PS side chains are segregated to the periphery of PVDF crystals, forming a confining interfacial layer. Due to the low polarizability of this confining PS-rich layer at the amorphous-crystalline interface, the compensation polarization is substantially decreased resulting in a novel confined ferroelectric behavior in these graft copolymers. Both dielectric and ferroelectric losses are significantly reduced at the expense of a moderate decrease in discharged energy density. Our study indicates that the best performance is achieved for a P(VDF-CTFE)-g-PS graft copolymer with 34 wt-% PS; a relatively high discharged energy density of approximately 10 J cm-3 at 600 MV m-1, a low dielectric loss (tanÎ = 0.006 at 1 kHz), and a low hysteresis loop loss (17.6%) at 550 MV m-1.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 3176-3188 |
| Number of pages | 13 |
| Journal | Advanced Functional Materials |
| Volume | 21 |
| Issue number | 16 |
| DOIs | |
| State | Published - Aug 23 2011 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Biomaterials
- Condensed Matter Physics
- Electrochemistry
Cite this
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Confined ferroelectric properties in poly(vinylidene fluoride-co- chlorotrifluoroethylene)-graft-polystyrene graft copolymers for electric energy storage applications. / Guan, Fangxiao; Yang, Lianyun; Wang, Jing; Guan, Bing; Han, Kuo; Wang, Qing; Zhu, Lei.
In: Advanced Functional Materials, Vol. 21, No. 16, 23.08.2011, p. 3176-3188.Research output: Contribution to journal › Article
TY - JOUR
T1 - Confined ferroelectric properties in poly(vinylidene fluoride-co- chlorotrifluoroethylene)-graft-polystyrene graft copolymers for electric energy storage applications
AU - Guan, Fangxiao
AU - Yang, Lianyun
AU - Wang, Jing
AU - Guan, Bing
AU - Han, Kuo
AU - Wang, Qing
AU - Zhu, Lei
PY - 2011/8/23
Y1 - 2011/8/23
N2 - Dielectric polymer film capacitors having high energy density, low loss and fast discharge speed are highly desirable for compact and reliable electrical power systems. In this work, we study the confined ferroelectric properties in a series of poly(vinylidene fluoride-co-chlorotrifluoroethylene)-graft- polystyrene [P(VDF-CTFE)-g-PS] graft copolymers, and their potential application as high energy density and low loss capacitor films. Thin films (ca. 20 μm) are prepared by different processing methods, namely, hot-pressing or solution-casting followed by mechanical stretching at elevated temperatures. After crystallization-induced microphase separation, PS side chains are segregated to the periphery of PVDF crystals, forming a confining interfacial layer. Due to the low polarizability of this confining PS-rich layer at the amorphous-crystalline interface, the compensation polarization is substantially decreased resulting in a novel confined ferroelectric behavior in these graft copolymers. Both dielectric and ferroelectric losses are significantly reduced at the expense of a moderate decrease in discharged energy density. Our study indicates that the best performance is achieved for a P(VDF-CTFE)-g-PS graft copolymer with 34 wt-% PS; a relatively high discharged energy density of approximately 10 J cm-3 at 600 MV m-1, a low dielectric loss (tanÎ = 0.006 at 1 kHz), and a low hysteresis loop loss (17.6%) at 550 MV m-1.
AB - Dielectric polymer film capacitors having high energy density, low loss and fast discharge speed are highly desirable for compact and reliable electrical power systems. In this work, we study the confined ferroelectric properties in a series of poly(vinylidene fluoride-co-chlorotrifluoroethylene)-graft- polystyrene [P(VDF-CTFE)-g-PS] graft copolymers, and their potential application as high energy density and low loss capacitor films. Thin films (ca. 20 μm) are prepared by different processing methods, namely, hot-pressing or solution-casting followed by mechanical stretching at elevated temperatures. After crystallization-induced microphase separation, PS side chains are segregated to the periphery of PVDF crystals, forming a confining interfacial layer. Due to the low polarizability of this confining PS-rich layer at the amorphous-crystalline interface, the compensation polarization is substantially decreased resulting in a novel confined ferroelectric behavior in these graft copolymers. Both dielectric and ferroelectric losses are significantly reduced at the expense of a moderate decrease in discharged energy density. Our study indicates that the best performance is achieved for a P(VDF-CTFE)-g-PS graft copolymer with 34 wt-% PS; a relatively high discharged energy density of approximately 10 J cm-3 at 600 MV m-1, a low dielectric loss (tanÎ = 0.006 at 1 kHz), and a low hysteresis loop loss (17.6%) at 550 MV m-1.
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U2 - 10.1002/adfm.201002015
DO - 10.1002/adfm.201002015
M3 - Article
VL - 21
SP - 3176
EP - 3188
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
IS - 16
ER -