N,N'-双(月桂酰基)乙二胺二丙酸钠的复配性能研究

Study on performances of sodium N,N'-bis(lauricethylenediamine) di-propionate

测定了N,N'-双(月桂酰基)乙二胺二丙酸钠(DLMC)及与十二烷基三甲基溴化铵(DTAB)和十二烷基聚氧乙烯(6)醚(AEO6)复配体系的表面张力,计算了DLMC及复配体系的表面化学性能参数;应用正规溶液理论得到复配体系内表面相和胶束相中2种表面活性剂之间的相互作用参数。结果表明,在25℃,0.1 mol·L-1NaBr水溶液中,DLMC的临界胶束浓度(cmc)为1.01×10-4mol·L-1,cmc下的表面张力(γcmc)为30.3 mN·m-1;DLMC/DTAB复配体系的γcmc,cmc和Amin均比单一组分要低;DLMC/AEO6复配体系的γcmc,cmc和Amin随着DLMC组分的增加先减小后有所增加。复配体系在形成胶束能力、降低表面张力效率及降低表面张力能力方面存在协同增效作用。

Surface tensions of sodium N, N＇ - bis （lauricethylenediamine） di - propionate （ DLMC ）, DLMC/ DTAB blend system and DLMC/AEO6 blend system were determined. The surface chemical parameters of DLMC as well as the blend systems were calculated. Interaction parameters between the two kinds surfactant in surface phase as well as micelle phase of the blend surfactant systems was calculated based upon normal solution theory. Results showed that in NaBr solution with concentration of 0.1 mol · L- 1 under 25℃, cmc of DLMC is 1.01 ×10-4 mol·L-1 ,and γcmc is 30.3 mN· m-1. The γ cmc and Amin of DLMC/DTAB blend system all are smaller than that of the single surfactant component in the blend system. The y cmc and Amin of DLMC/AEO6 blend system decrease at first, and then increase with the further addition of DLMC. The two blend systems exhibit synergic effect in both surface tension reduction capacity and efficiency, as well as capacity for formation of mixed micelles.