Competition between polymers for adsorption on silica: A solvent relaxation NMR and small-angle neutron scattering study

Catherine L. Cooper*, Terence Cosgrove, Jeroen S. Van Duijneveldt, Martin Murray, Stuart W. Prescott

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

30 Citations (Scopus)

Abstract

The competition between poly(vinylpyrrolidone) and poly(ethylene oxide) for adsorption at the silica surface was studied by solvent relaxation nuclear magnetic resonance and small-angle neutron scattering. The additive nature of the NMR relaxation rate enhancement was used to observe changes in the train layer when the two polymers were in direct competition for an increasing weight percentage of silica. PVP is shown to displace preadsorbed PEO from the particle surface, and this was observed for a range of PVP molecular weights. SANS measurements were found to give detailed information on the adsorption of the polymers in the separate systems; however, only qualitative information on the adsorption of the polymers could be obtained from the mixed samples. At a total polymer concentration of 0.4% w/v with 1.1% w/v silica, the SANS data were consistent with PVP adsorbing at the surface and dPEO remaining in solution, in agreement with the NMR data.

Original languageEnglish
Pages (from-to)12670-12678
Number of pages9
JournalLangmuir
Volume29
Issue number41
DOIs
Publication statusPublished - 15 Oct 2013

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