›› 2016, Vol. 24 ›› Issue (2): 289-292.DOI: 10.1016/j.cjche.2015.12.004

• Fluid Dynamics and Transport Phenomena • Previous Articles     Next Articles

Photorheologically reversible micelle composed of polymerizable cationic surfactant and 4-phenylazo benzoic acid

Jie Chen, Bo Fang, Hao Jin, Licheng Yu, Meng Tian, Kejing Li, Leiping Jin, Mo Yang   

  1. Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Lab of Chemical Engineering Rheology, Research Center of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2014-10-30 Revised:2015-09-23 Online:2016-03-14 Published:2016-02-28
  • Supported by:
    Supported by the National Natural Science Foundation of China (21273072).

Abstract: A photorheologically reversible micelle composed of polymerizable cationic surfactant n-cetyl dimethylallyl ammonium chloride (CDAAC) and trans-4-phenylazo benzoic acid (trans-ACA) was prepared. The effects of molar ratio of CDAAC/trans-ACA, time of UV and visible light irradiation and temperature on the rheological properties of micellar system were investigated. The results show that before UV irradiation the system with an optimum CDAAC/trans-ACA molar ratio of 1.4 forms viscoelastic micelles at 45 ℃. After 365 nm UV irradiation, the viscosities of micelle systems with different concentrations at fixed molar ratio of 1.4 are decreased by 85%-95%. The CDAAC/trans-ACA (14mmol·L-1/10mmol·L-1) micelle system exhibits shear thinning property and its viscosity is decreased obviously with the increases of UV irradiation time less than 1 h. The rheological process during UV irradiation for CDAAC/trans-ACA (14mmol·L-1/10mmol·L-1) micelle proves that viscosity, elastic modulus G' and viscous modulus G″ will reduce quickly with the UV light. Furthermore, the micelle system after 1 h UVirradiation is able to revert to its initial high viscositywith 460 nmvisible light irradiation for 4 h, and the micelle can be cycled between low and high viscosity states by repetitive UV and visible light irradiations. The UV-Vis spectra of CDAAC/trans-ACA micelle indicate that its photosensitive rheological properties are related closely to photoisomerization of trans-ACA to cis-ACA.

Key words: Photorheological micelle, Polymerizable cationic surfactant, 4-Phenylazo benzoic acid, Rheological properties