Experimental determination of self-diffusivities through a polymer network for single components in a mixture

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• 作者：Daniel Fierro¹ ; Nico Scharnagl² ; Thomas Emmler³ ; Adriana Boschetti-de-Fierro⁴ ; Volker Abetz  ; ;   ; ^{volker.abetz@hzg.de}
• 关键词：Diffusion coefficient ; Diffusion theory ; Diffusion through polymer matrix ; PFG-NMR ; Organic solvent nanofiltration
• 刊名：Journal of Membrane Science
• 出版年：2011
• 出版时间：15 November 2011
• 年：2011
• 卷：384
• 期：1-2
• 页码：63-71
• 全文大小：809 K

文摘

Diffusion models such as Vrentas & Duda diffusion theory and Wesselingh & Bollen multicomponent diffusion model have been used together with estimated tracer diffusion coefficients in order to provide a predictive method to calculate thermodynamic diffusion coefficients needed for transport simulation in polymer membrane processes. PFG-NMR measurements were carried out in order to estimate the tracer diffusion coefficients for solvent¨Csolvent¨Cpolymer systems on free-standing crosslinked polymer films. The use of experimentally determined diffusivities for a set of finite solvent-solvent-polymer concentrations as well as of plausible assumptions in nanofiltration allows the estimation of the unclear parameters presented in the diffusion theories with the subsequent predictability for those systems.