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Preparation and Dielectric Energy Storage Properties of Thermoplastic Polyimide/Polyvinylidene Fluoride Composite Film |
MA Yizhou1, ZHAO Qiuying1, YANG Lu2, QIU Jinhao1() |
1.State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 2.College of Mechanics and Materials, Hohai University, Nanjing 210098, China |
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Cite this article:
MA Yizhou, ZHAO Qiuying, YANG Lu, QIU Jinhao. Preparation and Dielectric Energy Storage Properties of Thermoplastic Polyimide/Polyvinylidene Fluoride Composite Film. Chinese Journal of Materials Research, 2023, 37(2): 89-94.
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Abstract Polyimide (PI) and polyvinylidene fluoride (PVDF) were dissolved in N, N-dimethylformamide (DMF) separately, and the two solutions were blended, then the blending was dropped gradually into a mixture of alcohol and pure water to generate precipitated floccules. Finally, the floccule was collected and dried, then hot-pressed to prepare the all-organic composite film of thermoplastic polyimide/polyvinylidene fluoride. The compatibility, crystallization behavior, and energy storage performance of the composite film were characterized by means of SEM, XRD, DSC, dielectric and ferroelectric tests. It follows that the PI/PVDF film prepared by this method is compact and uniform with only few voids. The addition of PI promotes the formation of γ-phase, but has little effect on the breakdown performance of PVDF film, while obviously improves its energy storage performance. When the addition amount of PI is 5%, a high energy storage density of 6.52 J·cm-3 can be generated by an electric field of 300 MV·m-1, which is about 1.4 times that of pure PVDF film in the same condition.
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Received: 02 December 2021
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Fund: National Key Research and Development Program of China(2021YFB3400100) |
About author: QIU Jinhao, Tel: (025)84891123, E-mail: qiu@nuaa.edu.cn
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