A theoretical and experimental study of interfacial tension of immiscible polymer blends in solution

The interfacial properties of demixed solutions of polymer blends are studied. We develop a theory of interfacial concentration profiles taking into account excluded volume effects which are important in solutions. The predictions differ considerably from those obtained by classical mean-field appro...

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Bibliographic Details
Published in:The Journal of chemical physics 1987-12, Vol.87 (12), p.7248-7256
Main Authors: BROSETA, D, LEIBLER, L, LATIFA OULD KADDOUR, STRAZIELLE, C
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:The interfacial properties of demixed solutions of polymer blends are studied. We develop a theory of interfacial concentration profiles taking into account excluded volume effects which are important in solutions. The predictions differ considerably from those obtained by classical mean-field approaches, especially concerning the interfacial thickness. The theory allows us to calculate the interfacial thickness and interfacial tension without any adjustable factor. We measured interfacial tension of demixed poly(styrene)–poly(dimenthylsiloxane) mixtures dissolved in toluene as a function of molecular weight of polymers and monomer concentration. A very good agreement with theoretical predictions is found.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.453369