Influence of silane coupling agent on morphology and dielectric property in BaTiO3/polyvinylidene fluoride composites

Abstract

Surface of BaTiO3 particle was chemically modified using silane coupling agent (KH550) in order to improve its compatibility with polyvinylidene fluoride (PVDF) matrix polymer, and therefore, expectable microstructure and dielectric property of the BaTiO3/PVDF composites were acquired. Infrared spectra reveal an obvious interaction between BaTiO3 and PVDF induced by the addition of KH550 coupling agent, and the interaction was also confirmed by the observation of morphology of fractured surface of the BaTiO3/PVDF composite when the concentration of KH550 is around 1.0wt%. Crystal lattice parameter of BaTiO3 in the composite was also changed because of the interaction. Finally, increased dielectric constant in the PVDF matrix composite with BaTiO3 treated by 1.0wt% KH550 was found.

BaTiO3–P(VDF-TrFE) composite ink properties for printed decoupling capacitors

“…The printed composite showed higher relative permittivity than has been previously reported with the same loading level, while the dielectric losses remain at the same level [8][9][10][11][12][13][14][15]. This is almost certainly due to the selection of the matrix material and the particle size, and the new fabrication technique including chemical solution processing with specific surfactant and printing which enabled a low agglomeration level and a more uniform distribution of the filler.…”

The effect of processing conditions on the morphology, thermomechanical, dielectric, and piezoelectric properties of P(VDF-TrFE)/BaTiO3 composites

“…Although the piezoelectric coefficient d 33 of conventional BaTiO 3 is lower than that of PZT, a large effort is lately taking place in fabricating high-performance BaTiO 3 [19]. In addition to this, polymer/BaTiO 3 composites are also of great interest for the fabrication of high-relative permittivity materials for, e.g., embedded capacitors [20][21][22][23][24]. For polymer/BaTiO 3 composites the reported absolute values for d 33 are usually between 1 and 30 pC/N [6,8,25,26] (the sign depending on the polarization conditions in the case of piezoelectric polymer matrices), although a d 33 higher than 50 pC/N was reported for a PVDF/BaTiO 3 composite [27].…”

Effect of silane coupling agent on the morphology, structure, and properties of poly(vinylidene fluoride–trifluoroethylene)/BaTiO3 composites

“…As matrix-filler interfacial interactions largely determine the final structure and properties of these composites, increasing effort has been devoted to the understanding and tailoring of the matrix-filler interface [9,20,24,25]. The surface functionality of modified fillers was found to influence the crystalline structure of VDF polymer matrices.…”

“…Surface functionalization of CaCO 3 with a fluorinated alkoxysilane led to PVDF nanocomposites with enhanced filler dispersion, better thermal stability and improved gas barrier [30], while a commercial organo-silane coated ZnO only slightly increased the storage modulus of a P(VDFTrFE) based nanocomposite versus uncoated ZnO, with no influence on the dispersion state of the filler or on the crystallinity of the matrix [31]. High permittivity nanocomposite films were fabricated by embedding, into VDF-based polymer matrices, BaTiO 3 particles that were surface modified with fluorinated phosphonic acid [32], dopamine [27,33], organofunctional titanates with long alkyl chains [34,35], aminopropyl triethoxy silane [25], or surface hydroxylated by refluxing in aqueous H 2 O 2 [36,37]. Furthermore, in a different approach, BaTiO 3 nanoparticles were generated in situ in a PVDF-g-HEMA copolymer, in which the -OH group of the HEMA units acted as a bridge with the nanoparticles surface, obtaining high dielectric constant, although the dielectric losses also increased with BaTiO 3 concentration [38].…”