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Polymers 2019, 11(1), 109; https://doi.org/10.3390/polym11010109

Segregation versus Interdigitation in Highly Dynamic Polymer/Surfactant Layers

1
Faculty of Engineering and Science, University of Greenwich, Medway Campus, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK
2
Science and Technology Facilities Council, ISIS Facility, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, UK
3
Institut Laue Langevin ILL, 6 rue Jules Horowitz, 38000 Grenoble, France
4
School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3TB, UK
*
Author to whom correspondence should be addressed.
Received: 12 December 2018 / Revised: 23 December 2018 / Accepted: 28 December 2018 / Published: 10 January 2019
(This article belongs to the Special Issue Polymeric Foams)
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Abstract

Many polymer/surfactant formulations involve a trapped kinetic state that provides some beneficial character to the formulation. However, the vast majority of studies on formulations focus on equilibrium states. Here, nanoscale structures present at dynamic interfaces in the form of air-in-water foams are explored, stabilised by mixtures of commonly used non-ionic, surface active block copolymers (Pluronic®) and small molecule ionic surfactants (sodium dodecylsulfate, SDS, and dodecyltrimethylammonium bromide, C12TAB). Transient foams formed from binary mixtures of these surfactants shows considerable changes in stability which correlate with the strength of the solution interaction which delineate the interfacial structures. Weak solution interactions reflective of distinct coexisting micellar structures in solution lead to segregated layers at the foam interface, whereas strong solution interactions lead to mixed structures both in bulk solution, forming interdigitated layers at the interface. View Full-Text
Keywords: Pluronic; surfactants; foams; SANS; multilayers Pluronic; surfactants; foams; SANS; multilayers
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Mansour, O.T.; Cattoz, B.; Beaube, M.; Heenan, R.K.; Schweins, R.; Hurcom, J.; Griffiths, P.C. Segregation versus Interdigitation in Highly Dynamic Polymer/Surfactant Layers. Polymers 2019, 11, 109.

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