Interfacial tension of phase-separated polydisperse mixed polymer solutions

Mark Vis, Edgar M. Blokhuis, Ben H. Erné, R. Hans Tromp, Henk N.W. Lekkerkerker

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

Aqueous two-phase systems provide oil-free alternatives in the formulation of emulsions in food and other applications. Theoretical interpretation of measurements on such systems, however, is complicated by the high polydispersity of the polymers. Here, phase diagrams of demixing and interfacial tensions are determined for aqueous solutions of two large polymers present in a mass ratio of 1:1, dextran (70 kDa) and nongelling gelatin (100 kDa), with or without further addition of smaller dextran molecules (20 kDa). Both in experiments and in calculations from Scheutjens-Fleer self-consistent field lattice theory, we find that small polymers decrease the interfacial tension at equal tie-line length in the phase diagram. After identifying the partial contributions of all chemical components to the interfacial tension, we conclude that excess water at the interface is partially displaced by small polymer molecules. An interpretation in terms of the Gibbs adsorption equation provides an instructive way to describe effects of polydispersity on the interfacial tension of demixed polymer solutions.

Original languageEnglish
Pages (from-to)3354-3362
Number of pages9
JournalJournal of Physical Chemistry B
Volume122
Issue number13
DOIs
Publication statusPublished - 5 Apr 2018

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Polymer solutions
Surface tension
Polymers
interfacial tension
Dextran
polymers
Polydispersity
Dextrans
dextrans
Phase diagrams
Lattice theory
Molecules
Gibbs adsorption equation
phase diagrams
Gelatin
Emulsions
binary systems (materials)
gelatins
Oils
food

Cite this

Vis, M., Blokhuis, E. M., Erné, B. H., Tromp, R. H., & Lekkerkerker, H. N. W. (2018). Interfacial tension of phase-separated polydisperse mixed polymer solutions. Journal of Physical Chemistry B, 122(13), 3354-3362. https://doi.org/10.1021/acs.jpcb.7b09967
Vis, Mark ; Blokhuis, Edgar M. ; Erné, Ben H. ; Tromp, R. Hans ; Lekkerkerker, Henk N.W. / Interfacial tension of phase-separated polydisperse mixed polymer solutions. In: Journal of Physical Chemistry B. 2018 ; Vol. 122, No. 13. pp. 3354-3362.
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Vis, M, Blokhuis, EM, Erné, BH, Tromp, RH & Lekkerkerker, HNW 2018, 'Interfacial tension of phase-separated polydisperse mixed polymer solutions', Journal of Physical Chemistry B, vol. 122, no. 13, pp. 3354-3362. https://doi.org/10.1021/acs.jpcb.7b09967

Interfacial tension of phase-separated polydisperse mixed polymer solutions. / Vis, Mark; Blokhuis, Edgar M.; Erné, Ben H.; Tromp, R. Hans; Lekkerkerker, Henk N.W.

In: Journal of Physical Chemistry B, Vol. 122, No. 13, 05.04.2018, p. 3354-3362.

Research output: Contribution to journalArticleAcademicpeer-review

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