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Crystallization kinetics of montmorillonite/poly(vinylidene fluoride) composites and its correlation with the crystalline polymer phase formation

Lopes, A.C. ; Ferreira, J.C. Coelho ; Costa, C.M. ; Lanceros-Méndez, S.

Thermochimica acta, 2013-12, Vol.574, p.19-25 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Crystallization kinetics of montmorillonite/poly(vinylidene fluoride) composites and its correlation with the crystalline polymer phase formation
  • Autor: Lopes, A.C. ; Ferreira, J.C. Coelho ; Costa, C.M. ; Lanceros-Méndez, S.
  • Assuntos: Crystal structure ; Crystallization ; Crystallization kinetics ; Fluorides ; Growth ; microscopy ; Montmorillonite ; Nucleation ; Poly(vinylidene fluoride) ; polymers ; Polyvinylidene fluorides ; Reduction ; Spherulite ; Spherulites ; temperature
  • É parte de: Thermochimica acta, 2013-12, Vol.574, p.19-25
  • Notas: http://dx.doi.org/10.1016/j.tca.2013.08.003
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  • Descrição: The crystallization kinetics of poly(vinylidene fluoride), PVDF, and montmorillonite, MMT, clay composites is studied. The MMT fillers act as nucleation agents of the PVDF polymer, leading to a lower spherulite growth rate but an overall reduction of the crystallization time. This fact, together with the polymer–clay surface interactions, is at the origin of the nucleation of the electroactive γ-phase of PVDF by the un-modified MMT clays. •PVDF in the gamma phase shows piezoelectric response.•Montmorillonite fillers nucleate the gamma phase of PVDF.•Montmorillonite fillers increases nucleation efficiency.•Montmorillonite fillers slow spherulitic growth.•Composite crystallization rate allow thus tailoring polymer phase. Isothermal crystallization of poly(vinylidene fluoride), PVDF, was studied in the presence of montmorillonite, MMT, fillers by polarization optical microscopy, POM. The spherulite growth was monitored as a function of time for different crystallization temperatures and the crystallization kinetics was evaluated with the help of the Avrami theory. The incorporation of MMT fillers is responsible for a reduction of the crystallization time of the polymer based on an increase of the nucleation and a reduction of the spherulite growth rate, the nucleation effect dominating therefore the overall crystallization kinetics. The slowing of the spherulitic growth rate by the presence of the clays due to the clay–polymer interactions is responsible for development of the γ crystalline phase of PVDF in the composites.
  • Editor: Elsevier B.V
  • Idioma: Inglês;Holandês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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