为了探究含不同数目聚氧乙烯基团(EO)的窄分布脂肪醇醚硫酸钠(N-AEnS)与十四烷基三甲基溴化铵(TTAB)复配体系的相行为及N-AE5S/TTAB双水相体系(ASTP)的形成机理。通过静态表面张力、宏观相行为及微观聚集体形貌对不同摩尔比及浓度的N-AEnS/TTAB(n=3,5,7,9)的相行为进行了表征。研究结果表明:随着EO基团数目的增加,N-AEnS/TTAB(n=3,5,7,9)复配体系的外观依次呈现乳白色液态(n=3)、分层(n=5)、蓝色透明液态(n=7)、无色透明液态(n=9),其相应的微观形貌依次为球形(n=3)、棒状(n=5)、球形(n=7),且在N-AE9S/TTAB复配体系中并未观察到聚集体。静电相互作用力和疏水作用对N-AE5S/TTAB双水相体系的形成起主要作用。
The phase behaviors of the mixtures of tetradecyltrimethylammonium bromide (TTAB) and narrow-distribution sodium fatty alcohol ether sulfate (N-AEnS) containing different number of oxyethylene units(EO) (n) were investigated, as well as the mechanism of the formation of aqueous two-phase systems (ASTP) of N-AE5S/TTAB. The phase behaviors of N-AEnS/TTAB (n = 3, 5, 7, 9) with different molar ratios and concentrations were studied by static surface tension, macroscopic phase behavior and microscopic aggregate morphology. The results showed that with the increase of EO number, the mixtures of N-AEnS/TTAB appear to be milky white liquid (n = 3), phase separation (n = 5) , bluish transparent liquid (n = 7) and colourless transparent liquid (n = 9) . Corresponding microscopic morphologies are spherical aggregates (n = 3) , rod-shaped aggregates (n = 5) , spherical aggregates (n = 7) , and no aggregates in N-AE9S/TTAB. Electrostatic interaction and hydrophobic interaction play major roles in the formation of ASTP of N-AE5S/TTAB.