Surface Rheological Properties of Hydrophobically Modified Polyacrylamide and Imidazolium Surfactant Systems |
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| Authors: | Ting Zhou Jing Yuan Yijian Chen Xia Xin Yebang Tan Guiying Xu |
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| Affiliation: | 1. , Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, People's Republic of China;2. , College of Science, China University of Petroleum (East China), Qingdao, People's Republic of China |
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| Abstract: | The dilational rheological properties of hydrophobically modified polyacrylamide (HMPAM) or hydrolyzed polyacrylamide (HPAM) solutions without and with imidazolium surfactants (C14‐4‐C14im]Br2 and C14mim]Br) at the air/water surface were investigated using oscillating bubble measurements. The results obtained suggest that imidazolium surfactants interact with the polymer on the surface, enhancing the dilational viscoelasticity of surface film. The dilational modulus value of C14‐4‐C14im]Br2/HMPAM is higher than that of the C14mim]Br/HMPAM system at low polymer concentration, confirming that C14‐4‐C14im]Br2 with two head groups and two hydrophobic chains can combine with a polymer to form a strong film on the surface. Moreover, imidazolium surfactants have stronger hydrophobic interaction with HMPAM chains than those of HPAM, thus enhancing the surface film strength for a surfactant/HMPAM system. The surface interaction mechanism between polyacrylamide and imidazolium surfactant is proposed to result from the electrostatic interactions and the hydrophobic effect. |
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| Keywords: | Dilation rheological properties Imidazolium surfactant Hydrophobically modified polyacrylamide |
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