【摘要】 采用流变和荧光等方法研究了季铵盐阳离子双子表面活性剂C12-2-C12.2Br(S2)与水溶性高分子羟丙基纤维素(hydroxypropyl cellulose HPC)质量分数1%的水溶液的相互作用。HPC/S2水溶液在剪切速率r=0~700s-1内均表现为牛顿型。混合溶液η0随着表面活性剂浓度的增加开始升高,在表面活性剂浓度约2.0mmol·L-1时出现峰值,然后呈缓慢下降趋势。稳态荧光测定I1/I3及电导测定电导率随S2浓度变化的结果表明:HPC/S2水溶液中两者相互作用,S2在HPC分子上形成了聚集体,临界聚集浓度为0.7mmol·L-1,到2.0mmol·L-1时溶液中自由胶团生成。更多还原

【Abstract】 An experiment was conducted to study the interactions between the quaternary ammonium gemini surfactant C12-2-C12·2Br(S2) and hydroxypropyl cellulose(HPC) in aqueous solution by steady-state fluorescence as well as rheological experiments. S2/HPC aqueous solution kept Newtonian flow through out the range of shear rate from 0 to 700 s-1. The zero-shear viscosity η0 of S2/HPC aqueous solution first increases with S2 concentrations ranging from 0 to 2 mmol·L-1, and then changes slightly when S2 is higher than 2 mmol·L-1. Fluorescence quenching experiments show that the presence of HPC induces the aggregation of S2 at concentrations lower than the critical micelle concentration of S2 itself. Micelle-like S2 clusters bound to HPC. Critical aggregation concentration of S2 (CS2) is 0.7 mmol·L-1 in the S2/HPC aqueous solution. Free micelles of S2 formed at a concentration of CS2 higher than 2 mmol·L-1.更多还原