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Effect of Potassium Oleate on Rheological Behavior of Cationic Guar in Aqueous Solution with Varying Temperatures
Qin Wang,Hua-zhen Li,Yong-jun Xie,Hua-yu Li,Hai-yang Yang*
Author NameAffiliationE-mail
Qin Wang ACS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Hua-zhen Li ACS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Yong-jun Xie ACS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Hua-yu Li ACS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Hai-yang Yang* ACS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China yhy@ustc.edu.cn 
Abstract:
The rheology of the cationic guar (CG) solution was measured and the effects of potassium oleate (KOA) upon the rheological properties of CG solution were studied. The steady shear viscosity measurement has shown that the viscosity of CG solution increased dramatically in the presence of KOA. The viscosity enhancement of KOA upon CG solution can be approximate three orders in magnitude. The gel-like formation of CG solution is observed at the high concentration of KOA. The excess addition of KOA results in the phase separation of CG solution. The oscillatory rheological measurement has shown that the crossover modulus Gc (corresponding to either storage modulus G′ or loss modulus G″ at the frequency wc where G′ equals G″) for CG solution, decreases with the increasing the concentration of KOA in solution. On the other hand, the apparent relaxation time τapp (=1/wc) increases with increasing the concentration of KOA in solution. Our experimental results suggest that for surfactant such as KOA which has a stronger tendency to form micelles in solution, the cooperative hydrophobic interaction of polymer bound to surfactants is less necessary to the formation of aggregates in solution, especially at the high concentration of surfactants. In fact, with the increase of the concentration of KOA, the number of the aggregates which associate polymer together decreases whereas the intensity of these aggregates increases. The effect of temperature upon the aggregation is also significant. With the increase of temperature, the number of the aggregates increases whereas the intensity of these aggregates decreases, probably because the ionization of KOA increases at high temperature.
Key words:  Rheological behavior, Cooperative hydrophobic interaction, Electrostatic in-teraction, Cationic guar, Potassium oleate
FundProject:
油酸钾对不同温度下阳离子瓜儿胶水溶液流变行为影响
汪琴,李化真,谢永军,李化玉,杨海洋*
摘要:
实验测定了阳离子瓜儿胶水溶液的流变行为,讨论了油酸钾对其流变行为的影响.稳态剪切实验结果表明,加入油酸钾后,瓜儿胶溶液的零切黏度增加了近三个数量级,出现类似凝胶的性质.动态剪切实验结果表明,瓜儿胶溶液表观模量则随着油酸钾浓度的增加而增加,储存模量和损失模量对应的剪切模量随着油酸钾浓度的增加而减小.事实上,随着油酸钾浓度的增加,高分子交联在一起的聚集体数量逐渐减小,强度逐渐增加.温度的影响刚好相反,随着温度的升高,聚集体的数量逐渐增加,强度逐渐减小.
关键词:  流变行为,静电相互作用,阳离子瓜儿胶,油酸钾
DOI:10.1088/1674-0068/25/04/448-456
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