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Soluble complexes in aqueous mixtures of low charge density comb polyelectrolyte and oppositely charged surfactant probed by scattering and NMR
YKI – Ytkemiska institutet.
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2007 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 312, 21-33 p.Article in journal (Refereed)
Abstract [en]

A low charge density polyelectrolyte with a high graft density of 45 units long poly(ethylene oxide) side-chains has been synthesized. In this comb polymer, denoted PEO45 MEMA:METAC-2, 2 mol% of the repeating methacrylate units in the polymer backbone carry a permanent positive charge and the remaining 98 mol% a 45 unit long PEO side-chain. Here we describe the solution conformation of this polymer and its association with an anionic surfactant, sodium dodecylsulfate, SDS. It will be shown that the polymer can be viewed as a stiff rod with a cross-section radius of gyration of 29 Å. The cross section of the rod contracts with increasing temperature due to decreased solvency of the PEO side-chains. The anionic surfactant associates to a significant degree with PEO45 MEMA:METAC-2 to form soluble complexes at all stoichiometries. A cooperative association is observed as the free SDS concentration approaches 7 mM. At saturation the number of SDS molecules associated with the polymer amounts to 10 for each PEO side-chain. Two distinct populations of associated surfactants are observed, one is suggested to be molecularly distributed over the comb polymer and the other constitutes small micellar-like structures at the periphery of the aggregate. These conclusions are reached based on results from small-angle neutron scattering, static light scattering, NMR, and surface tension measurements.

Place, publisher, year, edition, pages
2007. Vol. 312, 21-33 p.
Keyword [en]
Comb polymer, Comb polyelectrolyte, Polymer–surfactant association, Polyelectrolyte–surfactant aggregate, Small-angle neutron scattering, Light scattering, NMR, Surface tension, Polyelectrolyte, Surfactant, SDS
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26671OAI: oai:DiVA.org:ri-26671DiVA: diva2:1053674
Note
A1858Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • modern-language-association-8th-edition
  • vancouver
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  • en-GB
  • en-US
  • fi-FI
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