The solubility of gases (CO2, CH4) and vapors (n-C4, n-C5) in Mixed Matrix Membranes (MMM) based on amorphous Teflon® AF1600 and fumed silica has been studied at room temperature. The addition of fumed silica nanoparticles in high free volume glassy polymers is known to alter the polymer chain packing, increasing the fractional free volume (FFV) of the polymeric phase and modifying its mass transport features. The traditional models for the permeability in composite materials do not capture this behavior, because they do not account for the increase of fractional free volume induced by the filler. In this work, we apply the NELF model to evaluate quantitatively the relevant morphological changes induced by the addition of fumed silica nanoparticles. In this procedure, the solubility data of one test penetrant in the mixed matrices are used to determine the effect of filler on the density of the polymeric phase and on its swelling behavior. The model is in good agreement with the experimental data obtained for density and swelling, and enables one to predict the solubility of any other penetrant in the MMM.
M. Galizia, M. Ferrari, M.G. De Angelis, G.C. Sarti (2009). Solubility and Swelling Isotherms in Mixed Matrix Membranes based of Teflon AF1600® and Fumed Silica. SANTIAGO DE COMPOSTELA : s.n.
Solubility and Swelling Isotherms in Mixed Matrix Membranes based of Teflon AF1600® and Fumed Silica
GALIZIA, MICHELE;FERRARI, MARIA CHIARA;DE ANGELIS, MARIA GRAZIA;SARTI, GIULIO CESARE
2009
Abstract
The solubility of gases (CO2, CH4) and vapors (n-C4, n-C5) in Mixed Matrix Membranes (MMM) based on amorphous Teflon® AF1600 and fumed silica has been studied at room temperature. The addition of fumed silica nanoparticles in high free volume glassy polymers is known to alter the polymer chain packing, increasing the fractional free volume (FFV) of the polymeric phase and modifying its mass transport features. The traditional models for the permeability in composite materials do not capture this behavior, because they do not account for the increase of fractional free volume induced by the filler. In this work, we apply the NELF model to evaluate quantitatively the relevant morphological changes induced by the addition of fumed silica nanoparticles. In this procedure, the solubility data of one test penetrant in the mixed matrices are used to determine the effect of filler on the density of the polymeric phase and on its swelling behavior. The model is in good agreement with the experimental data obtained for density and swelling, and enables one to predict the solubility of any other penetrant in the MMM.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
