黏度法研究非离子型高分子对盐水溶液中油酸钾聚集行为的影响

Effect of Nonionic Polymers on the Aggregation of Potassium Oleate in Aqueous Salt Solutions by Viscometric Method

测定了在不同浓度聚丙二醇(PPG)、聚乙二醇(PEG)和聚乙烯基吡咯烷酮(PVP)存在条件下油酸钾盐水溶液的黏度,研究了非离子型高分子对盐水溶液中油酸钾表面活性剂聚集行为的影响,结果表明,随着非离子型高分子的加入,油酸钾盐水溶液的黏度迅速下降,但是程度显著不同,不仅如此,加入更加疏水的聚丙二醇以后,油酸钾盐水溶液黏度下降的程度最低。由此可见,非离子型高分子疏水程度不是导致表面活性剂盐水溶液黏度下降的唯一因素,高分子与表面活性剂疏水和亲水基团之间的相互作用,以及由此形成的高分子/表面活性剂聚集体的形态,是决定表面活性剂盐水溶液黏度下降最主要的原因。

Viscosity of potassium oleate in aqueous salt solutions in the presence of poly（propylene glycol）（PPG）,poly（ethylene glycol）（PEG） and poly（vinyl pyrrolidone）（PVP） was measured and the effect of nonionic polymers upon the aggregation of potassium oleate（KOA） in aqueous salt solutions was studied.It has been found that the viscosity of KOA solution in the presence of salt all decreases swiftly by the addition of nonionic polymers.However,the extent of decreasing of the solution viscosity is significantly different.In peculiar,the viscosity of KOA solution in the presence of PEG and PVP is more swiftly than in the presence of PPG.The experimental results suggest the decreasing of the solution viscosity is not due to the hydrophobic interaction of nonionic polymers with surfactants alone.In fact,both the hydrophobic interaction and the hydrophilic interaction of nonionic polymers with surfactants,which determine the morphology of polymer/surfactant complex,are responsible for the decrease of the solution viscosity of KOA in the presence of salt.