十二酰胺丙基二甲基羟乙基氯化铵与十二烷基硫酸钠水溶液的表面吸附和胶束形成

利用十二酰胺丙基二甲胺和氯乙醇反应 ,合成了十二酰胺丙基二甲基羟乙基氯化铵 (DDHA)阳离子表面活性剂 ,将其与十二烷基硫酸钠 (SDS)以不同摩尔比进行混合 ,测定了混合系统的表面张力 ,计算了单一系统和混合系统的饱和吸附量、分子最小截面积 ,表面层和胶束中 DDHA的摩尔分率及分子间相互作用参数 ,目视观察了混合系统的浑浊情况。结果表明 :在降低γcmc和 cmc方面 ,DDHA SDS混合系统有协同效应 ,表面层和胶束的组成与二组分配比有关 ,但是非对称的 ,等物质的量混合物中 ,DDHA在胶束和表面层中具有较大的摩尔分数。DDHA与 SDS在实验测定的各混合系统中都不出现混浊

MICELLE FORMATION AND SURFACE ADSORPTION OF DODECANOYLAMIDOPROPYL DIMETHYL HYDROXYETHYL AMMONIUM CHLORIDE-SDS AQUEOUS SOLUTION

Dodecanoylamidopropyl dimethyl hydroxyethyl ammonium chloride (DDHA) was synthesized by dodecanoylamidopropyl dimethyl amine and chloroethanol. Sodium dodecyl sulfate (SDS) was mixed with DDHA in different molar ratio, and the surface tensions of DDHA SDS mixed systems were determined. X σ DDHA and X m DDHA , also the interaction parameters β σ and β m in the mixed single layer and mixed micelle in DDHA SDS mixed systems were calculated. It has shown that there is synergism in surface tension and cmc reduction of the mixed systems. The X σ and X m is related to X 1, but is unsymmetrical with X 1 in the condition of molar ratio of DDHA SDS is 1∶1. Molar fraction of DDHA in the mixed single layer and mixed micelle is bigger than that of SDS in the equal molar mixed systems. No cloudness of the mixed systems were observed.