Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (5): 998.

• Articles • Previous Articles     Next Articles

Effect of Gemini surfactant on the Interfacial Dilational Properties of Hydrophobically Modified Partly Hydrolyzed Polyacrylamide

CAO Xu-Long1*, ZHANG Lei2, CHENG Jian-Bo3   

  1. 1. Geological Research Institute of Shengli Oilfield Co.Ltd, SINOPEC, Dongying 257015, China;
    2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
    3. Science and Engineering College of Chemistry and Biology, Yantai University, Yantai 264005, China
  • Received:2009-08-31 Online:2010-05-10 Published:2010-05-10
  • Contact: CAO Xu-Long. E-mail: luyiqiao@hotmail.com
  • Supported by:

    国家重大科技专项基金(批准号: 2008ZX05011)和国家“八六三”项目(批准号: 2008AA092801)资助.

Abstract:

The dilational viscoelastic properties of hydrophobically modified partly hydrolyzed polyacrylamide in the absence or presence of Gemini surfactant were investigated at the decane water interface by means of longitudinal method and the interfacial tension relaxation method. The dilational elasticity of polymer solution shows strong frequency dependence due to the fast process involving the exchange of hydrophobic micro-domains between the proximal region and distal region in the interface. Gemini surfactant plays different roles in influencing the structure of adsorbed polymer layer at different surfactant concentrations. At low surfactant concentration, the addition of surfactant molecules formed mixed film with polymer, resulting in the increase of dilational elasticity at low frequency. At the same time, polymer chain could sharply decrease the dilational elasticity of surfactant film mainly due to the weakening of the strong interactions among long alkyl chains in surfactant molecules. At high surfactant concentration, the addition of surfactant molecules can decrease the dilational elasticity of polymer solution due to the fast process involving in the exchange of surfactant molecules between the interface and the mixed complex formed by surfactant molecules and micro-domains.

Key words: Dilational elasiticity; Dilational viscosity; Hydrophobically modified partly hydrolyzed polyacrylamide(HMPAM); Gemini surfactant; Relaxation process

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