660 / 2022-03-31 10:31:20

Aging characterization of P(VDF-HFP)-based nanocomposites filled with Co3O4 2D nanomaterials

dielectric film,Aging characterization,polymer-based nanocomposites,insultation performance

As one of the most promising candidates for next-generation high-performance insulating materials, nanocomposite dielectrics tend to have higher resistivity and breakdown field strength than substrates. In the past few decades, there are reports achieve good performance through the doping of various types and morphologies of nanomaterials, but there are few studies on aging characteristics, especially the systematic study of different dimensions of the same material. Therefore, we design and synthesize zero-dimensional (0D), 1D and 2D Co₃O₄ nanomaterials, using P(VDF-HFP) with high dielectric constant as the substrate, to analysis the characterization and electrical properties of nanocomposites before and after aging. The color of the film turns yellow after aging treatment, which is due to the formation of a part of conjugated double bond (C=C-C=C) structure on the molecular chain due to the bimolecular elimination reaction in PVDF-HFP. Because of the big π bond generated by its conjugation effect, the distance among the energy levels is shortened, and the electrons are easily excited. Therefore, the electrical properties of the aged samples significantly decreased. However, the big π bond makes deeper electron transfer between the macromolecule and 2D Co₃O₄ nanomaterials for low-concentration nanocomposites, which makes the role of trapping-detrapping space charge of interface is heightened. So, the reduction of insulation performance of aged Co₃O₄/ PVDF-HFP is effectively suppressed. This work not only provides an effective strategy for unravelling the aging mechanism of nanocomposites, but also actively explores the practical application of nanocomposites.