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用表面张力法、电导法,pH测定法研究全氟辛酸-十二烷基硫酸钠混合水溶液的胶团形成及全氟辛酸胶团的特性.结果表明:(1)电导法与pH测定法弥补了表面张力法的不足,进一步证明在碳氟链表面活性剂与碳氢链表面活性剂混合水溶液中形成两种胶团.(2)全氟辛酸与十二烷基硫酸钠混合水溶液中所形成的两种胶团,分别基本上由全氟辛酸和十二烷基硫酸钠组成.十二烷基硫酸钠的存在对全氟辛酸胶团的形成不显示影响.全氟辛酸的氢离子对十二烷基硫酸钠胶团显示反离子效应.(3)全氟辛酸是典型的离子型表面活性剂,由于它对氢离子的结合力特别强,其胶团几乎是电中性的.这一特性可以解释全氟辛酸-十二皖基硫酸钠混合溶液胶团形成的机制.
The surface tension method, conductivity method and pH measurement were used to study the micellar formation and perfluorooctanoic acid micellar properties of perfluorooctanoic acid-sodium dodecyl sulfate mixed solution.The results showed that: (1) The conductometric method and pH determination method make up the surface tension method , Further prove that two kinds of micelles are formed in the mixed solution of fluorocarbon chain surfactant and hydrocarbon chain surfactant (2) Two kinds of micelles formed in the mixed aqueous solution of perfluorooctanoic acid and sodium lauryl sulfate, Respectively, basically composed of perfluorooctanoic acid and sodium lauryl sulfate composition.The presence of sodium dodecyl sulfate on perfluorooctanoic acid micelle formation did not show the impact of perfluorooctanoic acid hydrogen ions on the sodium dodecyl sulfate micelle showed counterion effect. (3) Perfluorooctanoic acid is a typical ionic surfactant, because of its strong binding to hydrogen ions, the micelles are almost electroneutral. This characteristic can explain the perfluorooctanoic acid - sodium lauryl sulfate mixed solution of glue Mission formation mechanism.