期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 135, 期 21, 页码 -出版社
WILEY
DOI: 10.1002/app.46306
关键词
crystallization; dielectric properties; structure-property relationships
资金
- National Nature Science Foundation of China-NSAF [51773168]
- Chinese Postdoctoral Science Foundation [157691]
Large-scale mechanical stretching has been performed to modify the crystal phase structures of the pristine poly(vinylidene fluoride) (PVDF) and its copolymer poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] with various molar contents HFP in an attempt to improve their energy storage performances. It is found that the physical stretched PVDF and P(VDF-HFP) 95.5/4.5 mol % films have a phase transition from the nopolar -phase to highly polar -phase, which is different from the P(VDF-HFP) films with relative high HFP molar contents ( to phases). The following results show that the phase transition in these PVDF-based polymers has a significant effect on their dielectric and energy storage performances. On account of the reformation of the crystalline property and elimination of the impurity defects, an ultra-high breakdown electric field of approximate to 900 MV/m has been obtained in all the stretched samples. Consequently, the higher discharged energy densities of 27.1 and 27.7 J/cm(3) are calculated from the D-E loops of the -PVDF and -P(VDF-HFP) 95.5/4.5 mol % films, respectively. Regarding their excellent discharging energy density of approximate to 10 J/cm(3) under 600 MV/m for thousands of times, the stretched PVDF and its copolymer P(VDF-HFP)s are promising candidates for high power capacitors applications. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46306.
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