Effect of shell phase composition on the dielectric property and energy density of core‐shell structured BaTiO₃ particles modified poly(vinylidene fluoride) nanocomposites

Abstract

Dielectric nanocomposites have attracted much attention due to their wide applications in electronics and electrical industry. Recently, incorporating core-shell nanoparticles into polymer matrix to improve the dielectric properties of nanocomposites has been widely reported. Tailoring the interfacial region between the polymer and the nanoparticles plays a crucial role in achieving the desired dielectric and energy storage properties of nanocomposites. However, the effect of shell structure in the interface region on the dielectric and energy storage properties is rarely studied. Based on this, core-shell BaTiO 3 nanoparticles with two different shell polymers, a "hardsoft" copolymer of methyl methacrylate and butyl acrylate (P[MMA-BA]) and a "hard" homopolymer of methyl methacrylate (PMMA), were prepared in this paper. The effect of core-shell BaTiO 3 nanoparticles with different shell structures on the dielectric and energy storage properties of poly(vinylidene fluoride) (PVDF) was investigated in depth. Due to the formation of a tight interfacial region between P(MMA-BA)@BT and PVDF matrix, P(MMA-BA) @BT/PVDF nanocomposites not only have low dielectric loss but also higher energy efficiency than PMMA@BT/PVDF nanocomposites. This study suggests a potential strategy that fabricating a "hard-soft" copolymer shell on BaTiO 3 surface can obtain desirable energy storage efficiency than the single "hard" shell structure in dielectric nanocomposites.

Concurrently enhanced dielectric properties and energy density in poly(vinylidene fluoride)-based core–shell BaTiO3 nanocomposites via constructing a polar and rigid polymer interfacial layer

“…A taut layer developed between the interface of the matrix and nanoparticles can effectively reduce interface polarization and restrict the carrier charge migration and matrix chain movement, which leads to low e r . 35 On another side, the high-e r polymer shell gives birth to a plus effect on the boost of e r . 59 Since the dipole liquid crystal polymer PBCN can self-assemble into a columnar structure, and the dipoles are distributed in the shell layer of the cylinder in a single columnar polymer chain, the increased ''dipole-dipole'' interaction in the liquid crystal phase promotes the orientation polarization.…”

“…In contrast to inorganic modifiers, polymer organic modifiers present variability, including the molecular structure, [33][34][35] the polarity, 36 the molecular weight, the grafting density 37 and so on. For example, Huang et al 36 proved that the energy density and dielectric of P(VDF-HFP)-based nanocomposites referred to the polarity of the shell polymer.…”

A biosensor material with robust mechanical properties, fatigue-resistance, biocompatibility, biodegradability, and anti-freezing capabilities

“…A combination of ceramic fillers with conductive fillers could further improve the conductivity of the resulting composites. 23 The special core–strawberry structure design can prevent the agglomeration of nanoparticles and impart new functional properties. After a facile one-step reaction, the characteristic peaks (38.1°, 44.3°, 64.4°, and 77.4°) arising from the (111), (200), (220), and (311) planes of silver nanoparticles (Ag) are present in the X-ray diffraction (XRD) spectrum of BT@Ag (Fig.…”

“…21 Ceramic fillers such as BaTiO 3 (BT) are often incompatible with the polymer matrix due to the significant difference in surface energy and poor polymer–particle interfacial interactions. 23 Inorganic fillers tend to form agglomerates within polymer matrices which results in phase separation and poor properties. 24 In order to account for the difference of surface energy between the polymer-based matrix and inorganic fillers, 25 the design and construction of a special structure (core–strawberry structure) is an attractive approach to enhance the dispersion properties of inorganic nano-scale fillers.…”

Enhanced dielectric and energy storage properties of polypropylene by high‐energy electron beam irradiation

“…Secondly, due to the large electrical mismatch, the phase interface between nanoparticles and polymers has to be improved in order to keep high breakdown strength. [ 22,23 ] Therefore, the complex interface regulation process for PP nanocomposites is disadvantageous for large‐scale preparation and extensive application.…”