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Article

Crystallization of Polytetrafluoroethylene in a Wide Range of Cooling Rates: Nucleation and Diffusion in the Presence of Nanosilica Clusters

1
Université Côte d’Azur, Institut de Chimie de Nice, UMR CNRS 7272, 06100 Nice, France
2
Université Côte d’Azur, Institut de Physique de Nice, UMR CNRS 7010, 06100 Nice, France
*
Authors to whom correspondence should be addressed.
Academic Editor: Dimitrios Bikiaris
Molecules 2019, 24(9), 1797; https://doi.org/10.3390/molecules24091797
Received: 11 April 2019 / Revised: 6 May 2019 / Accepted: 6 May 2019 / Published: 9 May 2019
(This article belongs to the Special Issue Polymer Composites and Nanocomposites with Enhanched Properties)
Polytetrafluoroethylene (PTFE) is a polymer that displays exceptional properties. This synthetic fluoropolymer is also known to crystallize very fast upon cooling. The present work highlights for the first time the influence of nanosilica clusters on PTFE crystallization at fast cooling rates (up to 5000 K·s−1). The silica was synthesized from aqueous silicate solution and the surface modification was performed using TriEthoxyFluoroSilane (TEFS). In order to understand the crystallization behavior of PTFE/silica nanocomposite at a fast cooling rate, the measurements were carried out by Fast Scanning Calorimetry (FSC). The data were consequently combined with the measurements performed by conventional Differential Scanning Calorimetry (DSC). Interestingly, the results displayed variation of the crystallization behavior for the nanocomposite at fast cooling rates compared to slow cooling rates. The differences in crystal morphologies were then observed by Scanning Electron Microscopy (SEM) after slow and fast cooling rates. Finally, the effective activation energies (Eα) obtained from the crystallization under various cooling rates were combined in order to obtain one set of Hoffman-Lauritzen parameters. This procedure allowed us to show that the crystallization of PTFE in the presence of silica is promoted or hampered according to the cooling rates employed. View Full-Text
Keywords: polytetrafluoroethylene; silica; nanocomposite; crystallization kinetics; isoconversional analysis polytetrafluoroethylene; silica; nanocomposite; crystallization kinetics; isoconversional analysis
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MDPI and ACS Style

Bosq, N.; Guigo, N.; Persello, J.; Sbirrazzuoli, N. Crystallization of Polytetrafluoroethylene in a Wide Range of Cooling Rates: Nucleation and Diffusion in the Presence of Nanosilica Clusters. Molecules 2019, 24, 1797. https://doi.org/10.3390/molecules24091797

AMA Style

Bosq N, Guigo N, Persello J, Sbirrazzuoli N. Crystallization of Polytetrafluoroethylene in a Wide Range of Cooling Rates: Nucleation and Diffusion in the Presence of Nanosilica Clusters. Molecules. 2019; 24(9):1797. https://doi.org/10.3390/molecules24091797

Chicago/Turabian Style

Bosq, Nicolas, Nathanaël Guigo, Jacques Persello, and Nicolas Sbirrazzuoli. 2019. "Crystallization of Polytetrafluoroethylene in a Wide Range of Cooling Rates: Nucleation and Diffusion in the Presence of Nanosilica Clusters" Molecules 24, no. 9: 1797. https://doi.org/10.3390/molecules24091797

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