Author(s)

Chengxin Fang ¹, Yang Cui ¹, Han Chen ¹, Zeyu Zhu ¹, Mankai Wu ¹, Zhenhao Li ¹

Affiliation(s)

¹ Zhejiang University of Water Resources and Electric Power, Hangzhou, Zhejiang, 310018, China

Corresponding Author

Yang Cui

ABSTRACT

To overcome the low energy density of polymer dielectrics, high-polarization poly(vinylidene fluoride) (PVDF) and high-breakdown-strength poly(methyl methacrylate) (PMMA) composites were fabricated via solution blending (B-PVDF/PMMA) and layered hot-pressing (L-PVDF/PMMA). FTIR analysis reveals that blending introduces steric hindrance that disorders polar crystalline domains, whereas the layered structure effectively preserves the highly crystalline β-phase. Benefiting from Maxwell-Wagner-Sillars interfacial polarization and the physical barrier effect of the PMMA layer, the layered film significantly suppresses conduction loss and retards electrical tree growth. It achieves an enhanced breakdown strength of 495 MV/m with a Weibull shape parameter of 13.41, outperforming the blended system (482 MV/m, shape parameter 8.29). Consequently, at 518 MV/m, the layered composite delivers a superior discharge energy density of 9.53 J/cm3 while maintaining a charge-discharge efficiency of 75%, providing an effective structural design strategy for high-performance dielectric energy storage.

KEYWORDS

Composite dielectric, Energy storage, High breakdown strength

CITE THIS PAPER

Chengxin Fang, Yang Cui, Han Chen, Zeyu Zhu, Mankai Wu, Zhenhao Li. Study on Energy Storage Performance of Dielectrics Based on PVDF/PMMA Blends and Multilayer Structures. Journal of Materials, Processing and Design (2026). Vol. 10, No.1, 43-49. DOI: http://dx.doi.org/10.23977/jmpd.2026.100106.

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