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Isothermal crystallization kinetics of poly(vinylidene fluoride) in the α-phase in the scope of the Avrami equation

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Abstract

Isothermal melt crystallization of poly(vinylidene fluoride) (PVDF) at different crystallization temperatures was studied by differential scanning calorimetry. Analysis by the two different approaches of the Avrami equation was performed: first the classical double logarithmic approximation was used, but a non-linear least squares search showed to clearly improve the fit of the model to the experimental isotherms. The differences found by both methods in the Avrami parameters are discussed. The limitation of the Avrami equation in this polymer has to do not only with the fitting procedure to determine the parameters but also with the lack of a consistent physical interpretation of their temperature evolution. The melting behavior of the samples was analyzed and an equilibrium melting temperature of 190.9 °C was obtained by the Hoffmann–Weeks extrapolation. The samples crystallize in a spherulitic structure, as observed by optical microscopy with polarized light (OMPL). Lauritzen–Hoffmann theory was applied to analyze the crystallization kinetics and the Regime III was found for the crystallization of α-PVDF.

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Acknowledgements

The authors thank the COST action 12 “Structuring Polymers” and the Portuguese Foundation for Science and Technology (FCT) for financial support (Grants POCI/CTM/59425/2004, PTDC/CTM/69362/2006, and SFRH/BD/16543/2004 to V.S.). J.L.G.R. acknowledges the support of the Spanish Ministry of Science through Project No. MAT2007-66759-C03-01. The authors also thank to Solvay for providing the excellent quality material.

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Authors and Affiliations

  1. Departmento de Física, Universidade do Minho, Campus de Gualtar, 4710-057, Braga, Portugal

    V. Sencadas, C. M. Costa & S. Lanceros-Mendez

  2. CeNTI - Centre for Nanotechnology and Smart Materials, Rua Fernando Mesquita 2785, 4760-034, Vila Nova de Famalicão, Portugal

    C. M. Costa

  3. Centro de Biomateriales, Universidad Politécnica de Valencia, 46022, Valencia, Spain

    V. Sencadas & J. L. Gómez Ribelles

  4. Regenerative Medicine Unit, Centro de Investigación Príncipe Felipe, Autopista del Saler 16, 46013, Valencia, Spain

    J. L. Gómez Ribelles

  5. CIBER en Bioingeniería, Biomateriales y Nanomedicina, Valencia, Spain

    J. L. Gómez Ribelles

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  1. V. Sencadas
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  2. C. M. Costa
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  3. J. L. Gómez Ribelles
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  4. S. Lanceros-Mendez
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Correspondence to S. Lanceros-Mendez.

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Sencadas, V., Costa, C.M., Gómez Ribelles, J.L. et al. Isothermal crystallization kinetics of poly(vinylidene fluoride) in the α-phase in the scope of the Avrami equation. J Mater Sci 45, 1328–1335 (2010). https://doi.org/10.1007/s10853-009-4086-3

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  • DOI: https://doi.org/10.1007/s10853-009-4086-3

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