PVP-SDS缔合行为与pH及比浓黏度的关系

Relationship between association behavior of PVP-SDS and the change of pH or reduced specific viscosity

非离子聚合物-阴离子表面活性剂溶液的pH和黏度随体系内分子聚集形态的不同而发生改变,据此建立pH法和比浓黏度法研究了聚乙烯吡咯烷酮(PVP)与不同浓度十二烷基硫酸钠(SDS)的缔合行为,结果表明2种方法均可表征PVP-SDS的双临界浓度。比浓黏度曲线上的极小值和极大值使比浓黏度法具有很高的灵敏性和准确性,而pH法表明氢离子对PVP-SDS缔合行为有重要作用。

Methods by means of pH and reduced specific viscosity measurement were established to study polyvinylpyrrolidone （PVP） -sodium dodecylsulfate （SDS） association under various concentrations of SDS since pH and viscosity of the system are sensitive to aggregation behaviors. It is the fact that double critical concentrations of SDS in the PVP - SDS association can be characterized by both methods. The reduced specific viscosity method is more sensitive and accurate than the pH method for both the minimum and the maximum values appeared on reduced specific viscosity plots corresponding to double critical concentrations of SDS, whereas the advantage of the pH method is to support the important effect of hydrogen ion on establishment of the PVP- SDS association.