HPAM对表面活性剂-正构烷烃界面张力的影响

Effect of HPAM on the Interfacial Tension between Surfactant and Normal Alkanes

刘煜

LIU Yu

为获得超高分子量聚合物与表面活性剂之间的相互作用规律，考察了超高分子量部分水解聚丙烯酰胺（HPAM）对阴离子型表面活性剂烷基苯磺酸盐及阴-非离子型表面活性剂烷基三氧乙烯羧酸盐与正构烷烃间界面张力的影响。结果表明，HPAM加量增大，单长链烷基苯磺酸盐与正壬烷间的界面张力先降低后增加最后趋于稳定，双长链烷基苯磺酸盐和烷基三氧乙烯基羧酸盐与正壬烷间的界面张力迅速增加并逐渐稳定；HPAM通过改变烷基苯磺酸盐和烷基三氧乙烯基羧酸盐界面膜排列结构影响其降低界面张力的能力；HPAM水溶性较强，能改变表面活性剂在油水相中的分配能力，油相烷烃碳数低时，增强表面活性剂亲水性，导致界面张力升高， 油相烷烃碳数高时则影响不大。两种作用存在竞争关系，当表面活性剂界面活性较强时，HPAM对界面张力的影响主要通过改变界面膜排列结构来实现。图5 参13

In order to study the interaction between polymer with ultrahigh molecular weight and surfactant，the effect of partially hydrolyzed polyacrylamide（HPAM）with ultrahigh molecular weight on the interfacial tension（IFT）between anionic surfactant （alkylbenzene sulfonate）or anionic-nonionic surfactant（polyoxyethylene ether carboxylate）and normal alkanes was studied. The results showed that the IFT between single long chain alkylbenzene sulfonate and nonane decreased initially，then increased，and finally stabilized with the increase of HPAM concentration，while the IFT between double long chain alkylbenzene sulfonate or polyoxyethylene ether carboxylate and nonane increased rapidly and then stabilized. The ability to reduce IFT of surfactant was influenced by HPAM mainly through changing the interfacial film arrangement of alkylbenzene sulfonate and polyoxyethylene ether carboxylate. Besides，good water-solubility of HPAM led to the distribution capacity of surfactant in oil phase and aqueous phase. IFT between surfactant and normal alkane increased with increasing hydrophilicity of surfactant under low carbon number of alkyl chain. HPAM had no influence to IFT under high carbon number of alkyl chain. There was competition between two influences. When the interface activity of surfactant was strong，the influence of HPAM on IFT was achieved mainly by changing the interfacial film arrangement structure.

10.19346/j.cnki.1000-4092.2016.03.023