Abstract
In this paper, we report the results of a study of microstructure and thermal behavior of ceramic–polymer composites composed of barium strontium titanate Ba0.6Sr0.4TiO3 (BST60/40) and polyvinylidene fluoride (PVDF). The Ba0.6Sr0.4TiO3 ceramic powder was prepared by the sol–gel method. Thermal evolution of the dried gel as well as ceramic powder was studied by simultaneous thermal analysis. The composite BST60/40//PVDF was obtained by hot pressing method for volume fraction of BST60/40 ceramic powder c v = 50 %. The morphology of BST60/40//PVDF composite powder was observed by transmission electron microscopy and the morphology of BST60/40//PVDF composite sample was observed by scanning electron microscopy. Temperature dependence of dielectric constant and dielectric loss factor of BST60/40//PVDF composites was measured in the frequency range of f = (10 × 103–1 × 106) Hz. Dynamic mechanical properties of BST60/40//PVDF composites were measured by dynamic mechanical thermal analysis DMTA.
Highlights
Composite technology in general sets out to combine materials in such a way that the properties of the composite are the optimum for a particular application
In this paper, we report the results of a study of microstructure and thermal behavior of ceramic–polymer composites composed of barium strontium titanate Ba0.6Sr0.4TiO3 (BST60/40) and polyvinylidene fluoride (PVDF)
The morphology of BST60/40//PVDF composite powder was observed by transmission electron microscopy and the morphology of BST60/40//PVDF composite sample was observed by scanning electron microscopy
Summary
Composites made of ferroelectric ceramics and polymer are very attractive for applications since they combine properties, which are typical for polymers, like good flexibility and the capability of forming with high electroactivity (piezo- and pyroelectric) responses of electroceramics. Polymer matrix composites containing ferroelectric ceramic powder are widely studied because of their tailored dielectric, thermal, mechanical properties, and easy processing. One of the ferroelectric ceramics like barium titanate (BaTiO3) exhibits high dielectric constant (up to 5,000) depending on its grain size, purity, crystallographic direction, measuring temperature range, and method of preparation. It has low coefficient of thermal expansion, high thermal, and chemical stability. It is brittle and requires high processing temperatures To overcome these drawbacks, several BaTiO3-filled polymers such as polyetheretherketone, epoxy, polyimide, polystyrene, cyanoethyl ester of polyvinyl alcohol, and polyvinylidene fluoride (PVDF) composites have been studied [4].
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