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China Surfactant Detergent & Cosmetics ›› 2020, Vol. 50 ›› Issue (7): 433-438.doi: 10.3969/j.issn.1001-1803.2020.07.001

• Basic research •     Next Articles

Rheological properties of pH-responsive viscoelastic micellar system of oleylamidopropyl dimethyl amine/potassium hydrogen phthalate

CUI Xiu(),FANG Bo(),XU Hai-tao   

  1. Rheology Laboratory, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2019-11-10 Revised:2020-06-18 Online:2020-07-22 Published:2020-07-23
  • Contact: Bo FANG E-mail:XIUCUI_JDOI@163.com;fangbo@ecust.edu.cn

Abstract:

The pH responsiveness of the viscoelastic micellar system of oleylamidopropyl dimethyl amine (PKO-O)/potassium hydrogen phthalate (PHP) was studied by investigating the rheological properties such as steady-state shear viscosity, flow curve, shear thixotropy, viscoelasticity and thermal thixotropy of the fluid. The steady-state shear viscosity of the micellar system (pH=7.47) was high, which was 122.3 mPa·s at 200 s-1. And the steady-state shear viscosity could be switched cyclically between the status at pH 7.61, 7.47 and 6.40, indicating that this micellar system had good pH responsiveness. In addition, the PKO-O/PHP micellar system was shear-thinning and positive thixotropic fluid. The flow curve could be characterized by the Cross constitutive equation. The micellar system (pH=7.47) was a typical viscoelastic fluid with high complex modulus and significant thermal thixotropy.

Key words: oleylamidopropyl dimethyl amine, potassium hydrogen phthalate, pH-responsive micellar system, rheological property

CLC Number: 

  • TQ423