聚苯乙烯磺酸钠与N,N-十二烷基二甲基氧化胺胶束相互作用的研究

Study of interaction of sodium poly(styrenesulfonate) with N,N-dimethyldodecylamine oxide micelles by turbidimetry, dynamic light scattering and electrophoretic ligh scattering

采用浊度滴定法、电泳光散射法和动态激光光散射法研究了聚苯乙烯磺酸钠 (NaPSS)和N ,N -十二烷基二甲基氧化胺 (DMDAO)胶束的相互作用 .浊度滴定结果表明 :在临界胶束质子化程度为 βc 时 ,NaPSS与DMDAO胶束发生相互作用而形成可溶络合物 ,此 βc 对应于临界胶束表面电荷密度σc .动态光散射结果表明 :在不同离子强度下 ,DMDAO分别形成了球状和棒状胶束 ,采用与之对应的模型 ,计算了临界结合时的胶束表面电荷密度 .随着离子强度增加 ,σc 增加 ,表明相互作用随屏蔽效应增大而减弱 .

The interaction between sodium poly(styrenesulfonate)(NaPSS) and N,N-dimethyldodecylamine oxide(DMDAO) micelles was studied using turbidimetry, electrophoretic light scattering, and dynamic light scattering. The results of turbidimetry showed that soluble complexes formed between NaPSS and DMDAO micelles at a critical degree of micelle protonation corresponding to a critical micelle surface charge density σ c. The results of dynamic light scattering indicated the formation of spherical or rodlike micelles at different ionic strengths. From different models for spherical and rodlike micelles, the σ c values were calculated, which increases with increasing ionic strength, indicating the attenuation of interaction by increased shielding. The interaction was also confirmed by electrophoretic light scattering.