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  • 1
    Electronic Resource
    Electronic Resource
    A thermodynamic analysis on the coincidence of extrema conditions in the sorption equilibrium for ternary polymer systems (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 646-651 
    Details
    ISSN: 1435-1536
    Keywords: Ternary polymer systems ; thermodynamic analysis ; cosolvency ; cononsolvency ; sorption equilibrium ; coincidence of extrema conditions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Flory-Huggins theory of polymer solutions has been used to express the condition of extrema values in the total sorption, as well as the inversion point in the preferential adsorption parameters for termary polymer systems. Two approaches have been followed, the first considers the binary and ternary interaction parameters independent of polymer concentration and solvent composition. In the second one, this dependence has been introduced. Our attention is focused on the volume fraction of solvent mixture dependence of the above parameters, in order to confirm or not the coincidence between the extrema values and the inversion point. Several cosolvent and cononsolvent ternary polymer systems, have been used to test the validity of the equations obtained. Also, it has been verified, from an experimental point of view, that in cosolvent ternary polymer systems there is coincidence in both compositions while in cononsolvent ternary polymer systems, such coincidence does not appear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652826
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Correlation between transport and equilibrium properties through the ternary interaction parameter for cosolvent and cononsolvent polymeric systems (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 197-206 
    Details
    ISSN: 1435-1536
    Keywords: Ternarypolymericsystems ; secondvirialcoefficient ; intrinsicviscosity ; excessGibbsenergy ; cosolvent ; cononsolvent ; ternaryinteractionparameter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A study of the ternary polymer systems dimethyl formamide-ethyl acetate-polystyrene, chloroform-1,4 dioxane-polystyrene and tetrahydrofuran-chloroform-polystyrene was carried out by viscosity and light scattering at 298 K. A good correlation has been found between the excess intrinsic viscosity, unperturbed polymer dimensions, second virial coefficient and the excess Gibbs free energy by using a ternary interaction parameter, dependent on molecular weight. This modification enables the conversion between transport and equilibrium properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655470
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A comparative study between cosolvent and cononsolvent ternary polymer systems through the preferential adsorption coefficient (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 30-37 
    Details
    ISSN: 1435-1536
    Keywords: Ternary polymeric systems ; preferential adsorption coefficient ; cosolvent ; cononsolvent ; ternary interactions ; excess free energy ; intensity light scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Sorption equilibrium of polystyrene and poly (dimethyl siloxane) in mixed solvents has been monitored by means of the preferential adsorption coefficient experimentally determined from intensity light scattering measurements. The pairs of solvents used to dissolve each polymer sample have been selected for the purpose to perform cosolvent and cononsolvent ternary polymer systems. Flory-Huggins formalism including ternary interactions has been used to predict the sorption equilibrium for the cosolvent system and, for the first time, for cononsolvent ones. Moreover, the proportionality between binary and ternary interactions, recognized by Pouchly, is also corroborated for both ternary polymer systems. From a thermodynamic standpoint, the sorption equilibrium has been described by approaching the behavior of the “bulk solvent” to the binary liquid mixture through the excess Gibbs free energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652300
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Prediction of maxima and minima in the curve of total sorption parameter in ternary polymer systems. Influence of ternary interaction parameter (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 372-379 
    Details
    ISSN: 1435-1536
    Keywords: Ternary polymer systems ; extrema thermodynamic behavior ; total sorption parameter ; Flory-Huggins theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Flory-Huggins theory modified by Pouchly has been applied to predict maxima and minima in the curve of total sorption in ternary polymer systems formed by a polymer and two liquids. In this work, different diagrams based on experimental magnitudes easily obtained such as the difference in affinities of liquids, solvents and non solvents, and the solvent molar volume ratio. Total sorption parameter has been considered to be the decisive magnitude to define extrema conditions in both cosolvent and cononsolvent ternary polymer systems. The theoretical prediction is not altered by the inclusion of ternary interactions. Different examples of ternary systems dealing with vinyl polymers and polydimethyl siloxane have been used to test the above formalism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657418
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    Paper (German National Licenses)
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