Dominant role of wormlike micelles in temperature-responsive viscoelastic properties of their mixtures with polymeric chains

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• 作者：Vyacheslav S. Molchanov ; ^{molchan@polly.phys.msu.ru} ; Olga E. Philippova ^{phil@polly.phys.msu.ru}
• 关键词：HM PAAm ; hydrophobically modified polyacrylamide ; PAAm ; unmodified polyacrylamide ; ; overlap concentration of macromolecular coils ; ; overlap concentration of wormlike micelles ; G&prime ; dynamic storage modulus ; G&Prime ; loss modulus ; ¦Ç0 ; zero-shear vi
• 刊名：Journal of Colloid and Interface Science
• 出版年：2013
• 出版时间：15 March, 2013
• 年：2013
• 卷：394
• 期：Complete
• 页码：353-359
• 全文大小：338 K

文摘

Temperature 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 ¡ãC 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.