窄分布脂肪醇醚硫酸钠与十四烷基三甲基溴化铵复配体系相行为的研究

doi:10.3969/j.issn.1001-1803.2019.11.004

摘要/Abstract

摘要：

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-AE_nS）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-AE_nS/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-AE_nS/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。

关键词: 窄分布脂肪醇醚硫酸钠, 复配, 相行为, 双水相

Abstract:

The phase behaviors of the mixtures of tetradecyltrimethylammonium bromide （TTAB） and narrow-distribution sodium fatty alcohol ether sulfate （N-AE_nS） 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-AE_nS/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-AE_nS/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.

Key words: narrow-distribution sodium fatty alcohol ether sulfate, mixture, phase behavior, aqueous two-phase system

中图分类号:

TQ423

王新刚,杨效益,孙永强,郭朝华,李萍,李建波. 窄分布脂肪醇醚硫酸钠与十四烷基三甲基溴化铵复配体系相行为的研究[J]. 日用化学工业, 2019, 49(11): 721-726.

WANG Xin-gang,YANG Xiao-yi,SUN Yong-qiang,GUO Chao-hua,LI Ping,LI Jian-bo. Study on the phase behaviors of the mixtures of narrow-distribution sodium fatty alcohol ether sulfate and tetradecyltrimethylammonium bromide[J]. China Surfactant Detergent & Cosmetics, 2019, 49(11): 721-726.

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	cmc/ （mmol·L^-1）	γ_cmc/ （mN·m^-1）	β
N-AE₃S	0.170	28.18
N-AE₅S	0.158	33.01
N-AE₇S	0.059	34.81
N-AE₉S	0.014	36.23
TTAB	4.169	36.88
N-AE₃S/TTAB	0.013	25.75	-16.68
N-AE₅S/TTAB	0.018	27.29	-15.31
N-AE₇S/TTAB	0.034	30.01	-9.80
N-AE₉S/TTAB	0.020	31.37	-7.34