The successful construction of a thermogelling system for the hydrophobically modified polyacrylamide (HMPAM)/a-CD mixture is reported featuring an application to the host-guest approach. It has been shown that the thermogelling property, masked by the strong intermolecular hydrophobic interaction, can be engineered to display by means of the host-guest approach, requiring no special synthesis, no third competitive guest and no harsh conditions. The findings of this work provide the basis for understanding and controlling the properties of hydrophobically modified polymers, fostering their use in a wide range of applications, including microfluidics, controlled release, tertiary oil recovery and smart materials. Materials and methods MaterialsAcrylamide (AM), sodium dodecylsulfate (SDS) and ammonium persulfate (APS) were purchased from the Sinopharm Chemical Reagent Co. Ltd. Dodecyl 2-methylacrylate, a-CD and pyrene were obtained from Aldrich. All the materials were used as received without further purication and the reactions were performed using deionized (DI) water.
A new C 22 tailed sarcosinate anionic surfactant, 2-(N-erucacyl-N-methyl amido) acetate (EMAA), has been synthesized by use of the erucic acid and a hydrotrope-sarcosine. In contrast to the common method, which blends the hydrotrope with a surfactant, the sarcosine has been introduced into the anionic surfactant through chemical modification. Interestingly, the resultant C 22 tailed anionic surfactant shows excellent water solubility despite the ultra-long alkyl chain. Besides, the EMAA also exhibits high surface activity, and pH controllable micelles to vesicles transition (MVT). Rheology studies have revealed that the rheological properties of EMAA solutions are influenced by the concentration, temperature, salt, and pH dramatically. Aside from the excellent water solubility, the original feature highlighted in this work is that such a new C 22 tailed sarcosinate anionic surfactant exhibits good temperature resistance.Compared to the potassium oleate (KOA), the zero-shear viscosity of the EMAA solution is nearly 3 orders of magnitude higher under the same conditions.
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