Enhanced electric breakdown strength and high energy density of barium titanate filled polymer nanocomposites

Abstract

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Large-area dielectric breakdown performance of polymer films – Part II: Interdependence of filler content, processing and breakdown performance in polypropylene-silica nanocomposites

“…In an attempt to achieve nanocomposites with both high permittivity and high dielectric strength, the incorporation of surface-modified high-permittivity ceramic nanoparticles such as BaTiO 3 in moderate to high dielectric strength polymers has been studied extensively [24][25][26][27]. However, as a high nanoparticle volume fraction of ceramic particles (10-50 v/v-%) is often needed in order to increase the effective permittivity of the composite, excess local field enhancement due to the mismatch between the matrix-filler permittivities, formation of percolative pathways, nanoparticle agglomeration and increased porosity systematically lead to a decreased breakdown strength in comparison to the neat polymer [28][29][30][31], hence negating improvement in practical energy density.…”

Fluorocarboxylic acid-modified barium titanate/poly(vinylidene fluoride) composite with significantly enhanced breakdown strength and high energy density

“…11,12 However, the high surface energy of nanoparticle llers usually leads to agglomeration and phase separation from the polymer matrix, resulting in a poor interfacial interaction and a high defect density. 25 Continuing further, 2,3,4,5-tetrauorobenzoic acid was used as a modier in this paper, with the aim to study the inuence of the modier on the dielectric performance and the compatibility between the llers and the matrix, and provide further insight into the relation between the modier structure, the level of coverage and the dielectric properties of the composites. 13,14 So far, the efforts to ght against the deciency are mainly concentrated in two aspects: one is developing new compounding (dispersion) technology, 15 another is modifying the surface of the nanoparticle llers.…”

High Energy Density Dielectrics Based on PVDF‐Based Polymers

“…[39] Tw ot ypes of surface modifiers are frequently used to modify the surfaces of the nanofillers.S ome small molecule compounds,s uch as phosphoric acid, [40] hydrogen peroxide, [41] titanate, [42] and silanes, [22d, 42, 43] which have or can produce different functional groups,s uch as ÀOH, ÀNH 2 , ÀCOOH, À COOÀ, ÀSO 3 HÀ, ÀSO 3 2À ,a nd ÀPO 4 3À ,c an be used to improve compatibilityw ith the polymerm atrix. [34,40,44] In addition to small molecule compounds,s ome macromolecular species,s uch as polyolefin, polyester, polyacrylate,a nd polyether, can also be grafted ontot he surfaces of nanofillers to improve the compatibilityb etween the fillers and polymers. [45] Many publications investigate the dielectric nanocomposites with modified fillers for the energy storage applications, and we will not list all of them.…”