聚乙二醇-十二烷基硫酸钠水溶液的黏度特性研究

Investigation on viscosity characteristics of aqueous polyethylene glycol-sodium dodecylsulfate solution

采用乌氏黏度计测定了阴离子表面活性剂十二烷基硫酸钠(SDS)与非离子聚合物聚乙二醇(PEG)间不同程度缔合后的黏度行为。以基于SDS的比浓黏度变化获得PEG-SDS的双临界浓度,以基于PEG的比浓黏度变化反映其在较低缔合物浓度时呈现聚电解质的电黏效应以及盐屏蔽效应,并发现了PEG的链扩张现象。与PVP-SDS体系类似,上述现象归结为带电的SDS束缚胶束缔合于PEG分子链上形成了"拟聚电解质"。

Ubbelohde viscosimetry was applied to polyethylene glycol （PEG） associated by anionic investigate the viscosity characteristics of nonionic polymer surfactant sodium dodecylsulfate （SDS） in different ratios. Double critical concentrations of PEG - SDS were obtained by the change of SDS - dependent reduced specific viscosity. Electro - viscous effect as well as the related salt shielding effect similar to a real polyelectrolyte was observed by the change of PEG -dependent reduced specific viscosity in lower concentrations of associate. Polymer coil expansion was also found in the aqueous PEG - SDS solution. The above viscosity characteristics in the PEG- SDS system are attributed to the formation of ＂pseudo -polyelectrolyte＂ by the charged SDS bound micelles associating on the PEG chain similar with the PVP - SDS system.