PMMA brush-modified graphene for flexible energy storage PVDF dielectric films

Wang，Zhen1; Xue，Wenqing1; Yang，Yongzhi1; Li，Yuchao1; Wang，Shuangshuang1; Zhan，Yanhu1; Li，Wei1; Hao，Jigong1; Zha，Jun Wei2; Liu，Chen3; Cao，Yulin4; Lu，Zhouguang4

2023

10.1016/j.coco.2022.101411

Composites Communications   Impact Factor & Quartile

2452-2139

Flexible dielectric materials are highly desirable in many electric/electronic devices for energy harvesting applications, but they usually suffer from the paradox of high dielectric constant and large breakdown strength, thereby reducing the overall energy storage capacity and mechanical strength with large filler loadings. In this work, poly(methyl methacrylate) (PMMA) brush-modified graphene (rGO-g-PMMA) was successfully introduced into poly(vinylidene fluoride) (PVDF) matrix via solution casting method. The PMMA brush-modified graphene for one thing promoted graphene distribution in the PVDF matrix, for another, it effectively limited carrier leakage of conductive graphene by forming a thin insulating PMMA layer. Therefore, the dielectric constant of rGO-g-PMMA/PVDF films was obviously increased, while the dielectric loss was distinctly suppressed with a small addition of the “core-shell” like rGO-g-PMMA. What's more, the breakdown strength of composites increased with rGO-g-PMMA loadings up to 0.2 wt%, accompanied by a 157% increase in energy density of FGM-0.2 composite to that of neat PVDF. In addition, the obtained rGO-g-PMMA/PVDF dielectric films possessed improved thermal stability and mechanical strength due to the homogeneous dispersion and good interfacial adhesion of rGO-g-PMMA within PVDF matrix. Such study provided a new strategy in obtaining flexible, high strength and large energy storage dielectric films.

Composites Dielectric film Graphene poly(vinylidene fluoride) Polymer brush

SCI

English

Others

National Natural Science Foundation of China[52103054];National Natural Science Foundation of China[52177020];National Natural Science Foundation of China[52277022];Natural Science Foundation of Shandong Province[ZR2019MB053];Natural Science Foundation of Shandong Province[ZR2020ME033];Natural Science Foundation of Shandong Province[ZR2021MB056];

Materials Science

Materials Science, Composites

WOS:000972756200001

ELSEVIER SCI LTD

MATERIALS SCIENCE

2-s2.0-85143530624

Scopus

1.School of Materials Science and Engineering,Liaocheng University,Liaocheng,252059,China
2.School of Chemistry and Biological Engineering,University of Science and Technology Beijing,Beijing,100083,China
3.College of Materials Science and Engineering,Shenzhen University,Shenzhen,518055,China
4.Department of Materials Science and Engineering,Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Wang，Zhen,Xue，Wenqing,Yang，Yongzhi,et al. PMMA brush-modified graphene for flexible energy storage PVDF dielectric films[J]. Composites Communications,2023,37.

Wang，Zhen.,Xue，Wenqing.,Yang，Yongzhi.,Li，Yuchao.,Wang，Shuangshuang.,...&Lu，Zhouguang.(2023).PMMA brush-modified graphene for flexible energy storage PVDF dielectric films.Composites Communications,37.

Wang，Zhen,et al."PMMA brush-modified graphene for flexible energy storage PVDF dielectric films".Composites Communications 37(2023).