Diffusion in polymers with concentration dependent diffusivity
作者： Jan-Chan Huang , Helen Liu , Yl Liu
DOI: 10.1080/00914030108035864
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摘要: Abstract Diffusion coefficients of several solute-polymer systems can be characterized by an exponentially dependent function D = 0Exp(AC). The cumulative mass uptake after a step increase the solute concentration at surface was considered using film with finite thickness and semi-infinite domain. For diffusion equation solved numerically Crank—Nicholson method. results showed that beginning stage is proportional to √ for both constant diffusivity diffusivity. domain transformation variables led nonlinear second order ordinary differential which obtain function. calculation on agree in short time region. It concluded coefficient as determined exper...
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