Synergism in binary mixtures of surfactants: III. Betaine-containing systems
Synergism in binary mixtures of surfactants: III. Betaine-containing systems
复制标题
表面活性剂二元混合物的协同作用：III。
DOI：
10.1016/0021-9797(84)90129-2
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
B. Zhu
中科院分区：
文献类型：
--
作者：
M. J. Rosen;B. Zhu
研究的体系有C12 H25 N+（CH 2C 6 H5）（CH 3）CH 2COO −（C12 BMG）<$C12H25（OC 2 H4）8 OH、C12 BMG <$C12H25N+（CH 3）3Br−、C12 BMG <$C12H25SO3 −Na+（C12 SO 3 Na）和C10 H21 N+（CH 2C 6 H5）<$（CH 3）CH 2CH 2SO 3 <$C12SO3Na。利用非理想溶液理论，确定了混合单分子膜和混合胶束形成的分子相互作用参数βσ和βM。C12 BMG与第二表面活性剂的相互作用按非离子型<阳离子型>阴离子型的顺序增加。与阴离子的相互作用随着溶液pH的降低而增加。在pH = 4时，出现沉淀物C12 BMGH+·C12 SO 3 −。磺基甜菜碱表现出相当弱的相互作用与C12 SO 3 Na。C12 BMG与C12 SO 3 Na体系在形成混合单分子膜和混合胶束时表现出协同作用。两种表面活性剂的摩尔比的计算值，其中协同作用应存在于这两个方面，并为混合物的表面性质在其最大协同作用点同意与实验值。
Systems investigated were C12H25N+(CH2C6H5)(CH3)CH2COO−(C12BMG)C12H25(OC2H4)8OH, C12BMGC12H25N+(CH3)3Br−, C12BMGC12H25SO3−Na+(C12SO3Na), and C10H21N+(CH2C6H5)(CH3)CH2CH2SO3C12SO3Na. Using nonideal solution theory, the molecular interaction parameters for mixed monolayer and mixed micelle formation,βσandβM, respectively, were determined for these systems. The C12BMG interaction with the second surfactant increased in the order: nonionic < cationic ⪡ anionic. The interaction with the anionic increased with decrease in the pH of the solution. At pH ⪕ 4, a precipitate, C12BMGH+· C12SO3−appeared. The sulfobetaine showed considerably weaker interaction with C12SO3Na. The C12BMGC12SO3Na system showed synergism in mixed monolayer and mixed micelle formation. Calculated values for the molar ratios of the two surfactants over which synergism should exist in these two respects and for the surface properties of the mixture at its points of maximum synergism agreed well with the experimental values.