algerian journal of environmental science and technology
Volume 5, Numéro 1, Pages 909-911
2019-03-30
Authors : . Kouini B . Ouslimani N. .
Numerous models have been proposed for modeling water diffusion behavior in polymers and polymer composites. The most common approach is to apply Fick’s law to simple single-free-phase diffusion, due to its simplicity and mathematical tractability [1]. However, it has been demonstrated that diffusion of water in some glassy polymers is anomalous (non-Fickian). Two main approaches are proposed to model the anomalous diffusion. One is the Langmuir-type model for diffusion (LMD), assuming that absorbed water molecules consist of mobile and bound phases [2,3]; the other is the diffusion with time-varying diffusivity model (DTVD), where a constant coefficient of diffusion is replaced by a decreasing function of time (by analogy with a relaxation modulus for a viscoelastic solid) [4,5]. Several models have been proposed to predict the behavior of composites based on the analogy between thermal conductivity and diffusivity [6,7]. The most extensively cited model in polymer/clay nanocomposites is the Nielsen model, which predicts that relative permeability is only a function
Polymer/nanocomposites; Nanoclay; Water uptake; Fick’s la.
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pages 29-34.
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Ahmadi M.
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Hosseini L.
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pages 1-9.
Zenasni Mohamed Amine
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Meroufel Bahia
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George Béatrice
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pages 101-106.
Aroun I.
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Bensacia N
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Seffah K.
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Benyahia S.
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pages 1055-1061.
Laoun B.
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Belhamel M.
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Serir L.
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pages 267-276.