十六烷基三甲基水杨酸铵水溶液的流变行为

Rheological Behaviors of Cetyltrimethylammonium Salicylate in Aqueous Solution

研究了十六烷基三甲基水杨酸铵水溶液的流变性能.在0.6-15%(w%)的浓度范围内,体系中生成短棒状胶束,在低浓度时(0.4%-3%)体系呈现胶冻状外观。高于3%以后体系符合Maxwell流体行为,具有单一结构松弛时间.凝胶和Maxwell样的流体行为是因为体系中形成了三维网络结构,这种结构是由短棒状胶束之间以及水杨酸根与水分子之间形成的氢键构成.体系的高黏度来自于短棒状胶束之间的链接而不是缠结的长胶束.

＂lhe rheologlcal experiments were carried out the mlCellar SOlUtlOnS as a iunctlon 01 sur- factant concentration. This system forms short, rodlike micelles. Rheological behavior at low concentra- tion displays gel-like behavior up to 3 ~, while it follows Maxwell uid behavior with a single stress re- laxation time above 3 %. The gel-like and Maxwell-like viscoelasticities originate in a three-dimensional network formed by hydrogen bond linkages between short rodlike micelles, connecting carboxyl groups of salicylate anions and water molecules. The high viscosity is from the linkages between short rodlike micelles rather than from entangled long micelles.