Dielectric relaxations in PVDF/BaTiO3 nanocomposites

By C. Chanmal, J. Jog. 2008

284 citations recorded by the source corpus.

The present work aims at the study of molecular relaxations in PVDF/BaTiO3 nanocomposites using broadband dielectric spectroscopy. The nanocomposites of PVDF with BaTiO3 (10–30% by wt%) are prepared using simple melt mixing method. In dielectric permittivity study, two relaxation processes are identified corresponding to the crystalline, glass transition in the PVDF/BaTiO3 nanocomposites. The peaks shift to higher frequencies as the temperature is increased. Electric modulus formalism is used to analyze the dielectric relaxations to overcome the conductivity effects at low frequencies. In M′′ spectra two peaks are observed only at high temperature and low frequency whereas a single relaxation peak appears at low temperatures. The single relaxation peak appearing at low temperatures is the αc relaxation attributed to crystalline chain relaxation in PVDF and the second relaxation peak which appears only at high temperatures and at a frequency lower than αc relaxation is identified as MWS relaxation. The temperature dependence of αc relaxation and MWS relaxation follows Arrhenius type behavior.

Subfields: Biomedical Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/130c9e28b28a816d91cdf5e064d5b77ad76596ed

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In Biomedical Engineering

In Polymers and Plastics

Citations in the corpus

Dielectric studies on hybridised PVDF–ZnO nanocomposites (2011, background): “These results show a trend similar to those found in the previous works of PVDF nanocomposites [26,29,30].”
Effect of filler size and concentration on the structure and properties of poly(vinylidene fluoride)/BaTiO3 nanocomposites (2012, background): “Finally, it has been demonstrated that these interesting composites can be produced by up-salable processing methods, maintaining the properties of the ones prepared in laboratory conditions [16].”
Studies of structural, thermal and electrical behavior of polymer nanocomposite electrolytes (2008, background): “The existence of these two peaks may be due to the heterogeneity in the texture of the polymer composites [36].”
Dielectric properties of Poly(vinylidene fluoride)/ CaCu3Ti4O12 nanocrystal composite thick films (2010, methodology): “3 PVDF based composites are being studied in great detail [27-30] because of their better thermal stability, they are tough and can be easily processed by solution cast/injection mould/melt technique.”