Dominant role of wormlike micelles in temperature-responsive viscoelastic properties of their mixtures with polymeric chains
KAUST Grant NumberKUK-F1-034-13
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AbstractTemperature effects on the rheological properties of viscoelastic solutions containing entangled wormlike micelles of potassium oleate and hydrophobically modified polyacrylamide were studied in a wide range of polymer concentrations. A very pronounced drop of viscosity by four orders of magnitude was observed at heating from 20 to 78 °C both in the presence and in the absence of polymer indicating that the wormlike micelles are mainly responsible for this effect. The highly thermosensitive behavior was attributed to the shortening of micellar chains induced by heating. Although the decrease in viscosity is almost the same for both surfactant and surfactant/polymer systems, the absolute values of the viscosity in the presence of polymer are by few orders of magnitude higher, which is due to the formation of a common network of entangled polymer and micellar chains. As a result, the added polymer allows one to get highly temperature responsive system that keeps viscoelastic properties in a much wider range of temperatures, which makes it very promising for various practical applications. © 2012 Elsevier Inc.
CitationMolchanov VS, Philippova OE (2013) Dominant role of wormlike micelles in temperature-responsive viscoelastic properties of their mixtures with polymeric chains. Journal of Colloid and Interface Science 394: 353–359. Available: http://dx.doi.org/10.1016/j.jcis.2012.11.018.
SponsorsThe financial support of the program Scientific and Educational Staff of Innovative Russia in 2009-2013 and of the Russian Foundation for Basic Research is gratefully acknowledged. This publication is based on the work supported in part by Award No KUK-F1-034-13 made by King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The authors would like to express their gratitude to Dr. A.I. Kuklin and Dr. A.V. Rogachev for their assistance in SANS experiments.
CollectionsPublications Acknowledging KAUST Support
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