Three-dimensionally ordered macroporous BaTiO3 framework-reinforced polymer composites with improved dielectric properties

Abstract

Polymer composites with high dielectric constants are highly desired in advanced electronic devices and the modern electrical industry. The dielectric constant of three-dimensional filler-reinforced polymer composites is usually enhanced at the expense of flexibility. Herein, barium titanate inverse opals (BT_IOs) that have three-dimensionally ordered and interconnected macropores are prepared and introduced into a poly (vinylidene fluoride) (PVDF) matrix to tailor their dielectric properties. The composite films with 30 wt% BT_IOs exhibit a dielectric constant of 18.8 at 1 kHz, showing an enhancement of 154% and 35% compared with that of pristine PVDF and their corresponding composites reinforced with barium titanate nanoparticles, respectively. Meanwhile, the dielectric loss is suppressed at 0.088. The BT_IOs/PVDF composite films also maintain good flexibility and can be freely bent. This design of three-dimensionally ordered macroporous filler-reinforced polymer composites with improved dielectric constants and good flexibility presents promising applications of dielectric materials in flexible electronics.

Interface coupling and energy storage of inorganic–organic nanocomposites

“…Reproduced with permission. 63 49 Copyright 2013, Journal of Materials Chemistry A. (g) Sandwich structure with BT@HPC/PVDF as the outer layer and PVDF as the inner layer, (h) Schematic diagram of space charge polarization distribution in the BT@HPC/PVDF polymer composite sandwich structure (a pair of polarized positive and negative charges represents the SCP of BT@HPC hybridization), (i) variation in the discharge energy density and breakdown strength of the BT@HPC/PVDF composite with BT@HPC content.…”

“…Currently, a signicant amount of work has been done in the eld of IONC interface coupling, especially in the design of ceramic llers and polymer matrix interfaces, ller surface modication, 34,35 polymer surface functionalization, 25 multiphase doping, 36,37 and other aspects. 38,39 Starting from interface coupling and phase eld theoretical calculations, numerous studies have been conducted on core-shell structures, [40][41][42][43][44] sandwich structures, 22,37,[45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] and ller 3D network structures, [63][64][65][66][67][68] which break the thinking along the lines of traditional IONC compounds and open up the study of new IONCs. On this basis, some reviews have summarized the theory and origin of inorganic ceramics and polymer matrices for high energy storage performance, 69,70 whereas others have summarized the approaches for interface modication of inorganic ceramics or organic polymer matrices, 53 and the regulation of the interface structure in IONCs.…”