光散射法研究氧化胺胶束与聚苯乙烯磺酸钠的相互作用  

Studies on Interaction Between N,N-Dimethyldodecylamine Oxide and Sodium Polystyrenesulfonate via Light Scattering Method

作　　者：冯先华[1] 柳士忠[1] 宋慧婷[1] 

机构地区：[1]湖北大学化学与材料科学学院,武汉430062

出　　处：《高等学校化学学报》2003年第5期924-927,共4页Chemical Journal of Chinese Universities

基　　金：湖北省自然科学基金(批准号:99J066);湖北大学重点项目基金(批准号;A0013)

摘　　要：采用光散射法研究了十二烷基二甲基氧化胺(DDAO)胶束与聚苯乙烯磺酸钠(NaPSS)的相互作用,浊度滴定和激光光散射结果表明,DDAO胶束与NaPSS的相互作用受介质离子强度影响,但与胶束浓度无关,浊度滴定曲线出现一个转折点(β_c),而平均流体力学半径R_h对胶束离解度β的关系曲线出现2个转折点,在第一个转折点(β_1)时,胶束与NaPSS开始缔合,在第二个转折点(β_2)时,胶束与NaPSS的缔合达到饱和,β_2相当于浊度滴定曲线的转折β_c,β_2,和β_1不随离子强度而变化,采用β_1和β_c分别计算胶束与NaPSS发生缔合时的临界表面电荷密度,两者差距约为15％,电泳光散射也证实了β_1的存在。The interaction between sodium polystyrenesulfonate(NaPSS) and N,N-dimethyldodecylamine oxide (DDAO) micelles with different concentrations was studied by using turbidimetry, dynamic light scattering, and electrophoretic light scattering. While the interaction was controlled by ionic strength, the micelle concentration shows no effect on the interaction. Dynamic light scattering reveals that the binding of DDAO micelles to NaPSS occurs at a degree of micelle ionization ft prior to critical degree of micelle ionization , βc, which was obtained from turbidimetric titration. The critical micelle surface charge density at a point where micelles associate with polyelectrolyte has a difference of 15% for calculation using ft and ft. A rapid change in the electrophoretic mobility of the system is also observed in the vicinity of ionization degree of micelles corresponding to β1 in the dynamic light scattering.

关 键 词：光散射法 氧化胺胶束 聚苯乙烯磺酸钠 相互作用 表面活性剂 聚电解质 

分 类 号：O647.2[理学—物理化学] O641.3[理学—化学]