Abstract
Micron- and submicron-sized barium titanate (BaTiO3) particles, untreated and surface modified with aminopropyl triethoxy silane, were incorporated in poly(vinylidene fluoride–trifluoroethylene) to fabricate composites with up to 60 vol% of ceramic phase. The morphology and structure of solvent cast and compression-molded films, and their thermal, viscoelastic, and dielectric properties were investigated. When surface-modified BaTiO3 was used, it was possible to decrease both the viscoelastic and the dielectric losses of highly filled solvent cast films, while their storage modulus and relative permittivity either increased or remained equal, owing to reduced porosity and improved matrix-filler compatibility. The effect of BaTiO3 surface modification on the morphology of compression-molded films was less marked, leading to unchanged viscoelastic properties, and lower permittivity and dielectric losses. For all composites the frequency dependency of the dielectric properties at low frequencies was suppressed with modified BaTiO3.
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Acknowledgements
The authors would like to thank the Swiss National Science Foundation for funding in the framework of the Marie Heim-Vögtlin and Nano-Tera programs, and Solvay Solexis SpA for kindly providing the P(VDF–TrFE) and for fruitful discussion. Dr Li Jin, Felix Lindström and Arthur Aebersold are acknowledged for technical support, and the Powder Technology Laboratory (EPFL) and the Interdisciplinary Centre for Electron Microscopy (EPFL) for use of their equipment.
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Dalle Vacche, S., Oliveira, F., Leterrier, Y. et al. Effect of silane coupling agent on the morphology, structure, and properties of poly(vinylidene fluoride–trifluoroethylene)/BaTiO3 composites. J Mater Sci 49, 4552–4564 (2014). https://doi.org/10.1007/s10853-014-8155-x
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DOI: https://doi.org/10.1007/s10853-014-8155-x