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

Flexible dielectric materials are highly desirable in many electric/electronic devices for energy harvesting ap-plications, 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.

Automated summary

In this study, PMMA brush-modified graphene (rGO-g-PMMA) was successfully incorporated into PVDF matrix, resulting in increased dielectric constant and breakdown strength. The addition of rGO-g-PMMA also suppressed dielectric loss and improved thermal stability and mechanical strength of the obtained films. This research provides a new strategy for obtaining flexible, high strength, and large energy storage dielectric films.