Effect of porosity and hydrostatic pressure on water absorption in a semicrystalline fluoropolymer

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• 作者：Camilo Castro López ; Xavier Lefebvre…
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：51
• 期：8
• 页码：3750-3761
• 全文大小：3,063 KB
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• 作者单位：Camilo Castro López (1) (2)
  Xavier Lefebvre (1)
  Nadège Brusselle-Dupend (1)
  Marie-Hélène Klopffer (1)
  Laurent Cangémi (1)
  Sylvie Castagnet (2)
  Jean-Claude Grandidier (2)
  
  1. IFP Energies nouvelles, 1 et 4 avenue de Bois-Préau, 92852, Rueil-Malmaison, France
  2. Institut PPRIME, ENSMA, 86360, Chasseneuil-du-Poitou, France
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803

文摘

This paper discusses the effect of porosity and hydrostatic pressure on diffusion kinetics and equilibrium water uptake in a semicrystalline fluoropolymer. Water sorption experiments at atmospheric pressure and under water pressures up to 250 MPa were carried out during 18 months at 40 °C on reference and porous samples. Porosity of samples was induced due to a cavitation process occurring at the highest triaxiality area of waisted and notched specimens during tensile tests. Water uptake was found to be very sensitive to porosity, showing an increase in samples with a high void fraction. On the other hand, water content decreased with increasing pressure suggesting a compaction of the porous space in which water can be stored. Two models describing this water uptake behaviour were considered. The first is a classical model which assumes that sorption occurs only by diffusion following Fick’s law. Fick’s model was found to be in agreement with the experimental results. A “Langmuir-type” sorption model was also proposed to describe water uptake in porous samples, considering a two-phase water transport mechanism: one portion of the absorbed water diffuses through the polymer matrix and the other portion is stored in voids. This model was implemented in a user subroutine using ABAQUS™ software and simulations were confronted to experimental sorption curves showing satisfactory agreements. The potential of the Langmuir-type sorption model resides on its availability to be coupled to a poro-mechanical model, in order to improve the understanding of coupling between the mechanical behaviour and water sorption mechanism in a porous polymer.