Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (03): 671-676.doi: 10.3866/PKU.WHXB20110306

• SOFT MATTER • Previous Articles     Next Articles

Interaction of Hydrophobically Associating Polyacrylamide with Gemini Surfactant

CHEN Hong1, LI Er-Xiao2, YE Zhong-Bin1,2, HAN Li-Juan2, LUO Ping-Ya1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, P. R. China;
    2. School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
  • Received:2010-10-27 Revised:2010-12-14 Published:2011-03-03
  • Contact: CHEN Hong E-mail:chenh@swpu.edu.cn
  • Supported by:

    The project was supported by the Youth Fund of Sichuan Province, China (08ZQ026-001).

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Abstract:

A fatty acid disulfonate anionic gemini surfactant was prepared and the structure of the surfactant was characterized by 1H-NMR. Hydrophobically associating polyacrylamide was prepared according to a procedure from literature. The interaction between the hydrophobically associating polyacrylamide (HAPAM) and the anionic gemini surfactant was studied by surface/interfacial tension, apparent viscosity, and atomic force microscopy (AFM). Experimental results show that HAPAM can form a network structure in the aqueous solution by self assembly. Mixed micelles are formed by the interaction of gemini surfactant micelles and the hydrophobic microdomain of the hydrophobically associating polyacrylamide in aqueous solution, which plays a remarkable role in the surfactant and polymer assembly. Mixed micelles can enhance the inter- or intra-molecular association between the polymer molecules and the surfactant, which increases the strength of the network formed by the hydrophobically associating polyacrylamide. The apparent viscosity of the solution increased by the addition of the gemini surfactant. When the addition of the gemini surfactant exceeded a certain amount, the association between the hydrophobic groups of the polymer decreased and the network formed by hydrophobically associating interaction was weakened by the surfactant micelles, which led to a decrease in solution viscosity. The polymer also largely influenced the interfacial properties of the gemini surfactant, especially the dynamical interfacial tension. A high polymer concentration led to an increase in the time required to reach equilibrium.

Key words: Gemini surfactant, Hydrophobically associating polyacrylamide, Interfacial tension, Viscosity, Atomic force microscopy