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Temperature induced formation of strong gels of acrylamide-based polyelectrolyte
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
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2009 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 337, 46-53 p.Article in journal (Refereed) Published
Abstract [en]

Very strong physical gels have been formed by moderate temperature increases in aqueous dispersions of acrylamide-based beads and dissolved polymeric molecules. Rheometry, confocal laser scanning microscopy,  and differential scanning calorimetric studies of acrylamide-based copolymers with acrylic acid, [Poly(AM-co-AA)], and 2-acrylamido-2-methylpropane acid, [Poly(AM-co-NaAMPS)], suggest that the temperature induced swelling of the polymer beads and chains, create strongly entangled polymer networks, above the upper critical solution temperature. Analyses of the viscoelastic response showed that the time-scale for the gelation process is about minutes to hours. The addition of high concentrations of Ca2+ resulted in a significant decrease in the gel strength

Place, publisher, year, edition, pages
2009. Vol. 337, 46-53 p.
Keyword [en]
polyelectrolyte, UCST, rheology, storage modulus, salt stability, gelation
Identifiers
URN: urn:nbn:se:su:diva-34157ISI: 000268111800007OAI: oai:DiVA.org:su-34157DiVA: diva2:286247
Available from: 2010-01-14 Created: 2010-01-07 Last updated: 2017-12-12Bibliographically approved

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Ng, Jovice B.S.Bergström, LennartHedin, Niklas
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