疏水缔合聚丙烯酰胺与黏弹性表面活性剂的相互作用

摘要

The interaction of hydrophobically associating polyacrylamide(AP-P5) and viscoelastic surfactant(VES) was studied by the apparent viscosity method,surface tension method and fluorescence spectrum method. It was showed that,the effects of the interaction on the apparent viscosity and surface tension of the binary AP-P5-VES systems were significant. With increasing the VES concentration,the apparent viscosity of the binary AP-P5-VES systems firstly rapidly increased,then decreased suddenly,and finally smoothly rose. When the VES concentration reached a certain value,the viscosity of the binary system began to exceed that of AP-P5 itself. Because of the surface activity of AP-P5,the surface tensions of the binary systems were lower than that of the VES solution with low concentration. The mechanism of the interaction between VES and AP-P5 was closely related to the self-assembled morphology of VES. When VES existed in the form of single molecules or spherical micelles,mixed micelles would form from VES and the hydrophobic groups on AP-P5. When VES existed in the form of rod-like micelles,mixed supramolecular network would form.%借助黏度法、表面张力法、荧光光谱法研究了疏水缔合聚丙烯酰胺AP-P5与黏弹性表面活性剂VES的相互作用.实验结果表明,AP-P5与VES存在显著的相互作用,对AP-P5-VES二元体系的表观黏度、表面张力影响较大.随VES质量浓度的增大,二元体系的表观黏度快速升高后急剧降低再稳步升高.当VES的质量浓度达到一定值时,二元体系的表观黏度开始高于单一聚合物的表观黏度.与单独的表面活性剂溶液相比,随VES质量浓度的增大,AP-P5-VES二元体系的表面张力先低后高,最后趋于一致.VES与AP-P5的相互作用机理与表面活性剂的自组装形态密切相关.当表面活性剂以单分子形态或球状胶束存在时,它与聚合物的疏水基团形成混合胶束;当表面活性剂以棒状胶束形态存在时,它与聚合物缔合形成混合的超分子网络结构.