ISSN:
1435-1536
Schlagwort(e):
Ternary polymeric systems
;
preferential adsorption coefficient
;
cosolvent
;
cononsolvent
;
ternary interactions
;
excess free energy
;
intensity light scattering
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
Notizen:
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.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00652300
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