A capacitance study of pseudo-fickian diffusion in glassy polymer coatings
作者： M.M. Wind , H.J.W. Lenderink
DOI: 10.1016/0300-9440(95)00601-X
关键词: Grain boundary diffusion coefficient 、 Materials science 、 Permeation 、 Diffusion layer 、 Diffusion (business) 、 Effective diffusion coefficient 、 Thermodynamics 、 Analytical chemistry 、 Fick's laws of diffusion 、 Sorption 、 Relaxation (physics)
摘要: Abstract The permeation and sorption of water in eight coatings below the glass transition temperature was monitored using capacitance measurements. For each coating deviations from ideal-fickian diffusion were observed. rate found to decrease considerably. This anomalous (or non-fickian) behaviour is known literature as pseudo-fickian or two-stage sorption. To analyse measurements further a new method developed. data transformed time-dependent rate. analysis resulted pseudofickian model, which could also be represented by spectral distribution rates. results agree well with relaxation model Berens Hopfenberg. It shown that Berens-Hopfenberg particular, behaviour, general,can understood influenced free-volume relaxation.
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