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Citation: WANG Dong-xian, LUO Lan, ZHANG Lu, WANG Yi-yang, ZHAO Sui, YU Jia-yong. Study on Interfacial Interaction between Hydrophobically Modified Polyacrylamide and Surfactants[J]. Acta Physico-Chimica Sinica, ;2005, 21(11): 1205-1210. doi: 10.3866/PKU.WHXB20051103 shu

Study on Interfacial Interaction between Hydrophobically Modified Polyacrylamide and Surfactants

1.
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100101

Received Date: 2 March 2005
Available Online: 15 November 2005

The interfacial dilational viscoelastic properties of hydrophobically associating block copolymer composed of acrylamide (AM) and a low amount of 2-ethylhexyl acrylate (EHA) (＜ 1.0% mole fraction) with a hydrolysis degree of about 1.5%～2.0% at the octane-water interfaces were investigated by interfacial tension relaxation method. The influences of anionic surfactant sodium dodecyl sulfate (SDS), cationic surfactant cetyl trimethylammonium bromide (CTAB) and nonionic surfactant Triton X-100 on the dilational viscoelastic properties of 7 g•L-1 polymer solutions were studied. The results showed that surfactants can influence the dilational properties of polymer solutions by providing a new fast relaxation process involving the exchange of surfactant molecules between monomers and mixed micelles at interface. By adding SDS, this new process is so fast that its characteristic time can′t be obtained. However, for Triton X-100, which has a relative higher molecular weight, the characteristic time was about 0.9 s. By adding CTAB, the slow process changed obviously due to the strong electrostatic interaction between oppositely charged surfactant and hydrolyzed part of polymer chain.
- Associating polymer;Dilational modulus;Phase angle;Interface; Relaxation process
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