1. Shanghai Key Laboratory of Multiphase Structural Materials Chemical Engineering, Lab of Chemical Engineering Rheology, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
Tetraoctadecyl-erucic acid amidopropyl cationic tertiary amine (TCTA) and hexaoctadecyl-erucic acid amidopropyl cationic surfactant (HAEE) are synthesized from epichlorohydrin,octadecylamine,and erucic acid amidopropyl dimethyl tertiary amine (pKO-E).TCTA/NaSal,HAEE/NaSal and HAEE/NaCl viscoelastic micelles new systems are formed between TCTA,HAEE respectively and sodium salicylate (NaSal),sodium chloride (NaCl),respectively,and their rheological properties are investigated.The influences of salt concentration,temperature and surfactant concentration on the rheological properties of the micellar systems are explored,and the best composition of each viscoelastic micellar system is optimized.It is confirmed that the flow curves of all viscoelastic micellar systems conform to Carreau-Yasuda constitutive equation.A four-parameter rheo-kinetics equation is established,which can characterize the viscosity versus shear time curves.It is also verified that the HAEE/NaSal micellar system possesses both thermo-thickening and thermo-thixotropic behaviors.The viscosity and viscoelasticity of both HAEE/NaSal and HAEE/NaCl micellar systems increase with the increasing surfactant concentration.
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