关键词: 三联表面活性剂, 耐温性, 微结构, 流变学

Abstract: Wormlike micelles(WLMs)were formed in aqueous solutions of cationic trimer surfactant di(2-hydroxyl-dimethylene ether)-α,ω,γ-triple(dimethylcetylammonium chlorine),referred to as 16-4(OH)-16-4(OH)-16 by addition of sodium salicylate(NaSal)and sodium chloride(NaCl).The rheological properties of the micellar solution before and after polymerization were discussed by solubilizing styrene(S_t)into the cores of WLMs.The temperature(T)and shear resistance of systems of 16-4(OH)-16-4(OH)-16/NaSal/NaCl and cetyl trimethyl ammonium bromide(CTAB)/NaSal were compared with the viscosimetry method,and the properties of 16-4(OH)-16-4(OH)-16/NaSal/NaCl solutions before and after polymerization were characterized with the rheology method.The results showed that the optimum solubilization quantity of S_t for the CTAB/NaSal system was 0.05 g,and at 100℃ or after shearing 90 min,the η_a of its polymerization system was 66.9 mPa·s and 15.5 mPa·s,respectively.For the 16-4(OH)-16-4(OH)-16/NaSal/NaCl system,the best solubilization quantity of S_t was 0.10 g;the η_a of its polymerization system was 99.1 mPa·s after shearing 90 min incessantly at 100℃;the plateau modulus(G₀)of the polymerization system was higher than that of the solutions without S_t.Based on the above discussion,the "lock-in" of the microstructure of wormlike micelles formed by 16-4(OH)-16-4(OH)-16 with NaSal and NaCl can be realized by polymerization of S_t in the hydrophobic core of the micelles.

Key words: trimer surfactant, temperature resistance, microstructure, rheology