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Nucleation of the Electroactive γ Phase and Enhancement of the Optical Transparency in Low Filler Content Poly(vinylidene)/Clay Nanocomposites

Lopes, A. C ; Costa, C. M ; Tavares, C. J ; Neves, I. C ; Lanceros-Mendez, S

Journal of physical chemistry. C, 2011-09, Vol.115 (37), p.18076-18082 [Periódico revisado por pares]

American Chemical Society

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  • Título:
    Nucleation of the Electroactive γ Phase and Enhancement of the Optical Transparency in Low Filler Content Poly(vinylidene)/Clay Nanocomposites
  • Autor: Lopes, A. C ; Costa, C. M ; Tavares, C. J ; Neves, I. C ; Lanceros-Mendez, S
  • Assuntos: C: Nanops and Nanostructures
  • É parte de: Journal of physical chemistry. C, 2011-09, Vol.115 (37), p.18076-18082
  • Descrição: Poly(vinylidene fluoride), PVDF, based nanocomposites with different clay structures have been processed by solvent casting and melt crystallization. Depending on the melting temperature of the polymer, the nanocomposite recrystalises in the electroactive γ or nonelectroactive α phase of the polymer. This fact is related to the thermal behavior of the clay. For montmorillonite clay, the full crystallization of the electroactive γ phase occurs for clay contents lower than 0.5 wt %, allowing the nanocomposites to maintain the mechanical properties of the polymer matrix. The electroactivity of the material has been proven by measuring the piezoelectric d 33 response of the material. The obtained value of d 33 is −7 pC/N, lower than in β-PVDF obtained by mechanical stretching but still among the largest coefficients obtained for polymers. Further, the optical transmittance in the visible range is strongly enhanced with respect to the transmittance of the pure polymer. Finally, it is demonstrated that the nucleation of the γ phase can be also obtained in other clays, such as in kaolinite and laponite.
  • Editor: American Chemical Society
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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