The volumetric behavior of a polymer in presence of a penetrants or solvents is certainly a crucial parameter in determining its potential use in the membrane processes. The solubility, the diffusion coefficient as well as the other transport properties are indeed strongly connected to the way the polymer reacts and swells when the penetrant molecules diffuse into it. An excessive swelling often reduces the membrane selectivity and in glassy polymers the different sorption and dilation kinetics can lead to non-fickian or anomalous diffusion processes. The study of polymer dilation during sorption is thus of high interest in the field of membrane and membrane processes. In the present work the FTIR-ATR spectroscopy has been used to that aim spoiling the unique ability of this technique to contemporary monitor the evolution of the penetrant concentration in the polymeric matrix and the polymer modifications during sorption. One of the primary features of infrared spectroscopy, namely the effect of local environment on the location and intensity of infrared bands, allows indeed to monitor multiple processes when these impact on different parts of the IR-spectrum; this ability has been already used in different studies concerning multicomponent diffusion or diffusing-reacting systems always reaching a deeper inspection, at a molecular, level of the diffusion process.

Quantitative analysis of solvent induced polymer dilation through FTIR-ATR spectroscopy

GIACINTI BASCHETTI, MARCO;PICCININI, ENRICO;DOGHIERI, FERRUCCIO;SARTI, GIULIO CESARE
2005

Abstract

The volumetric behavior of a polymer in presence of a penetrants or solvents is certainly a crucial parameter in determining its potential use in the membrane processes. The solubility, the diffusion coefficient as well as the other transport properties are indeed strongly connected to the way the polymer reacts and swells when the penetrant molecules diffuse into it. An excessive swelling often reduces the membrane selectivity and in glassy polymers the different sorption and dilation kinetics can lead to non-fickian or anomalous diffusion processes. The study of polymer dilation during sorption is thus of high interest in the field of membrane and membrane processes. In the present work the FTIR-ATR spectroscopy has been used to that aim spoiling the unique ability of this technique to contemporary monitor the evolution of the penetrant concentration in the polymeric matrix and the polymer modifications during sorption. One of the primary features of infrared spectroscopy, namely the effect of local environment on the location and intensity of infrared bands, allows indeed to monitor multiple processes when these impact on different parts of the IR-spectrum; this ability has been already used in different studies concerning multicomponent diffusion or diffusing-reacting systems always reaching a deeper inspection, at a molecular, level of the diffusion process.
2005
International Congress on Membranes and Membrane Processes (ICOM) 2005
229
230
Marco Giacinti Baschetti; Enrico Piccinini; Ferruccio Doghieri; Giulio Cesare Sarti
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/19472
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