阴离子表面活性剂对聚乙二醇水溶液粘度的影响

Effect of anionic surfactants upon the viscosity of poly(ethylene glycol) in dilute solutions

测定了聚乙二醇(PEG)在十二烷基硫酸钠(SDS)和琥珀酸双-2-乙己酯磺酸钠(AOT)水溶液中的粘度,讨论了SDS和AOT在水溶液中聚集形态的差异对PEG与SDS和AOT相互作用的不同影响,结果表明:PEG-SDS与PEG-AOT体系粘度均明显增加,而PEG-SDS与PEG-AOT体系粘度变化机制不同,根本原因是表面活性剂在高分子溶液中聚集行为不同,SDS分子在PEG链上聚集,形成类胶束,使高分子链带电,表现出聚电解质的粘度行为;PEG链吸附于AOT囊泡,不同PEG链对囊泡的吸附可能造成高分子链更加伸展,PEG特性粘数增大,使溶液粘度上升。

The relative viscosity of anionic surfactant sodium dodecyl sulfate（SDS） and sodium bis（2-ethylhexyl） sulfosuccinate（AOT） in solutions containing a certain concentration of poly（ethylene glycol）（PEG） and the reduced viscosity of poly（ethylene glycol） in solutions containing a certain concentration of anionic surfactants was measured.It has been found that the viscosity of polymer-surfactant mixed solutions increased remarkably due to the polymer-surfactant interactions.PEG-SDS aggregates act as polyelectrolyte due to the binding of SDS molecules onto polymer chains.And the adsorption of PEG chains to AOT vesicles may be contributed to the increase of viscosity of PEG-AOT system.