Calorimetric determination of the enthalpy change for the binding of methyl orange to poly(vinylpyrrolidone) in aqueous solution |
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| Authors: | I Sardharwalla JB Lawton |
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| Affiliation: | Department of Biochemistry, University of Salford, Salford M5 4WT, England, UK |
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| Abstract: | Thermodynamic parameters have been determined for the interaction of methyl orange and poly(vinylpyrrolidone) in aqueous solutions containing tris, tris and hydrochloric acid, or water only. Enthalpy changes were determined by use of a flow microcalorimeter. Free energy changes were calculated from the results of equilbrium dialysis studies. The results are interpreted in terms of the behaviour of poly(vinylpyrrolidone) in these systems. Analysis of data shows that the hydrophobic interactions in the systems are in the order: tris > wateronly > tris-HC1. |
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| Keywords: | poly(vinylpyrrolidone) methyl orange microcalorimetry thermodynamic parameters hydrophobic interactions polymer configuration dye aggregation |
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