Abstract
Nanocomposites of the self-forming core-shell Co-MgO nanoparticles, which were of approximately 100 nm in diameter, and poly(vinylidene fluoride) (PVDF) polymer have been prepared. When the polymer is crystallized in the α-phase, the introduction of the nanoparticles leads to nucleation of the γ-phase of PVDF, increasing also the melting temperature of the polymer. With the introduction of the Co-MgO particles, the dielectric constant of the material slightly increases and the storage modulus decreases with respect to the values obtained for the pure polymer.
Highlights
Nanosized metal and semiconductor particles possess unique electronic, optical, and catalytic properties that are different from those of bulk crystals
Co and MgO structured particles are promising candidates as they possess a variety of outstanding physicochemical properties which are utilized in the Fischer-Tropsch catalysis, the carbon nanotube synthesis, and for hydrogen storage applications
Poly(vinylidene fluoride) (PVDF) is the main representative of a family of polymeric materials with interesting scientific and technological properties. This polymer is known for its outstanding electroactive properties and an unusual high dielectric constant with
Summary
Nanosized metal and semiconductor particles possess unique electronic, optical, and catalytic properties that are different from those of bulk crystals These properties make them attractive materials for fabricating hybrid composites based on a polymer matrix with nanoparticle fillers [1], allowing tailor-made electrical and optical composite responses. Nanocomposite films of PVDF in its a and b phases with core-shell Co-MgO nanoparticles were prepared by solution casting technique for different filler concentrations. The samples in the a-phase were obtained by maintaining the inside an oven for 60 min at 120°C to ensure complete crystallization of the nanocomposite and solvent removal. Samples in the b-phase were obtained by solvent evaporation at room temperature. The real (ε”) part of the permittivity and the dielectric losses (tan δ) were obtained in the frequency range 100 Hz to 1 MHz at room temperature with an automatic Quadtech 1929 Precision LCR meter
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