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Two novel UV photosensitive micellar systems, trimeric dodecyl anionic–cationic surfactant (TDCC)/ trans -OMCA, and trimeric cetyl anionic–cationic surfactant (TCCC)/ trans -OMCA, were successfully synthesized by using two different carbon chain length trimeric anionic–cationic surfactants (TACS, including TDCC and TCCC) and the photosensitive additive  trans -o-methoxycinnamic acid ( trans -OMCA). The incorporation of  trans -OMCA resulted in a peak in the zero shear viscosity ( η  0 ) of the system at pH = 6.17–6.61. The flow behaviour of the TACS/OMCA system was well described by the Carreau-Yasuda model. Prior to UV irradiation, the TCCC/ trans -OMCA system exhibited pronounced shear thinning, thixotropic, and viscoelastic properties. After UV irradiation at 365 nm, the isomerization of  trans -OMCA to  cis -OMCA caused the disruption of the network structures, leading to a significant decrease in the thixotropic and viscoelastic properties, resulting in a decrease in viscosity. The viscosity reduction rate of the TCCC/ trans -OMCA system reached 99 %. The influence of the hydrophobic carbon chain length on the UV responsiveness was also investigated. The TDCC/ trans -OMCA system exhibited an 86 % decrease in  η  0  after UV irradiation, highlighting the favorable effect of longer hydrophobic tail chains in improving the UV responsiveness of the micellar system. The UV light kinetics of the TCCC/ trans -OMCA solution were studied and a rheological model was developed to accurately describe the viscosity changes. The TCCC was found to predominantly exhibit cationic characteristics at pH = 6.17–6.61. In this pH range, the 2 wt% TCCC/0.12 wt% NaSal system exhibited excellent viscoelasticity, and the addition of  trans -OMCA disrupted the network structure resulting in a decrease in viscosity. After UV irradiation, the viscosity of the system increased by 2.5 times, confirming the potential of the TCCC/NaSal/ trans -OMCA micellar system as a UV thickener.

Study on rheology of a novel UV-light sensitive trimeric anionic–cationic surfactant/ trans - o -methoxycinnamic acid micellar system