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Ferroelectric nanocomposites of polyvinylidene fluoride/polymethyl methacrylate blend and BaTiO3 particles: Fabrication of beta-crystal polymorph rich matrix through mechanical activation of the filler

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2014
Authors
Mofokeng, Tladi G.
Luyt, Adriaan S.
Pavlović, Vera P.
Pavlović, Vladimir
Dudić, Dusko
Vlahović, Branislav
Djoković, Vladimir
Article (Published version)
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Abstract
Nanocomposites of polyvinylidene fluoride/polymethyl methacrylate (PVDF/PMMA) blend and mechanically activated barium titanate (BaTiO3) particles were prepared by melt mixing. Modification of filler by means of mechanical activation has a profound effect on the crystallization of PVDF in the blend matrix. Raman analysis showed that the modified BaTiO3 particles, due to higher specific surfaces, induce, predominantly, the crystallization of the electrically active beta-phase of PVDF, while the initial micron size particles induce the formation of the most common but non-polar alpha-crystal form. The introduction of activated particles reduces the overall crystallinity but slightly affects the crystallization and melting temperatures of the matrix. Dielectric spectroscopy revealed that at fixed filler content the dielectric constant of the blend increases with decreasing of the particle size (increasing of the activation time). A similar trend was observed for the storage moduli in dynam...ic mechanical analysis; the stiffness of the composite was higher when mechanically activated particles were used.

Source:
Journal of Applied Physics, 2014, 115, 8
Publisher:
  • Amer Inst Physics, Melville
Funding / projects:
  • project NSF CREST [HRD-0833184]
  • project NASA [NNX09AV07A]
  • National Research Foundation in South AfricaNational Research Foundation - South Africa
  • Size-, shape- and structure- dependent properties of nanoparticles and nanocomposites (RS-172056)
  • Directed synthesis, structure and properties of multifunctional materials (RS-172057)
  • Materials of Reduced Dimensions for Efficient Light Harvesting and Energy conversion (RS-45020)

DOI: 10.1063/1.4866694

ISSN: 0021-8979

WoS: 000332619600066

Scopus: 2-s2.0-84896795393
[ Google Scholar ]
URI
http://aspace.agrif.bg.ac.rs/handle/123456789/3652
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  • Radovi istraživača / Researchers’ publications
Institution/Community
Poljoprivredni fakultet

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