The theory of diffusion in n-component systems has been applied to study the mutual diffusion of polydisperse polymeric systems. General relations for n-component systems have been obtained for the experimental Gouy parameters, DA and Q0. Through the use of the Flory equation for diffusion coefficients of monodisperse polymers, the expressions of DA and Q0 at infinite dilution, D∞A and Q∞0, for a general molecular weight distribution have been obtained. These relations have been used to analyze the effect of polydispersity on Gouy diffusion parameters, and the relative information content of Q∞0 is stressed. A procedure is suggested to determine the molecular weight and to estimate the results of the fractionation through the Gouy interferometry. The results of this analysis have been applied to polyethyleneglycol, polyacrylic acid, and sodium polyacrylate diffusion data
Analysis of the Diffusion in Pseudobinary Systems: Applications of Gouy Interferometry Parameters to Polydisperse Systems / Vergara, Alessandro; Paduano, Luigi; V., Vitagliano; R., Sartorio. - In: JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL. - ISSN 1520-6106. - ELETTRONICO. - 103:41(1999), pp. 8732-8738. [10.1021/jp991182q]
Analysis of the Diffusion in Pseudobinary Systems: Applications of Gouy Interferometry Parameters to Polydisperse Systems
VERGARA, ALESSANDRO;PADUANO, LUIGI;
1999
Abstract
The theory of diffusion in n-component systems has been applied to study the mutual diffusion of polydisperse polymeric systems. General relations for n-component systems have been obtained for the experimental Gouy parameters, DA and Q0. Through the use of the Flory equation for diffusion coefficients of monodisperse polymers, the expressions of DA and Q0 at infinite dilution, D∞A and Q∞0, for a general molecular weight distribution have been obtained. These relations have been used to analyze the effect of polydispersity on Gouy diffusion parameters, and the relative information content of Q∞0 is stressed. A procedure is suggested to determine the molecular weight and to estimate the results of the fractionation through the Gouy interferometry. The results of this analysis have been applied to polyethyleneglycol, polyacrylic acid, and sodium polyacrylate diffusion dataI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
