聚氧乙烯与非等摩尔正负离子表面活性剂混合体系的相互作用

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (10): 2012.

聚氧乙烯与非等摩尔正负离子表面活性剂混合体系的相互作用

王晨¹, 严鹏¹, 肖进新^1,2

1. 北京分子科学国家实验室, 北京大学化学与分子工程学院, 北京 100871;
2. 北京氟乐邦表面活性剂技术研究所, 北京 100080

收稿日期:2008-04-21 出版日期:2009-10-10 发布日期:2009-10-10
通讯作者: 肖进新, 男, 博士, 主要从事胶体与界面化学研究. E-mail: xiaojinxin@pku.edu.cn
基金资助:
国家自然科学基金(批准号: 20573007)资助.

Interaction of Polyethylene Oxide with Non-equimolarly Mixed Cationic-Anionic Surfactants

WANG Chen¹, YAN Peng¹, XIAO Jin-Xin^1,2*

1. Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;
2. Beijing FLUOBON Surfactant Institute, Beijing 100080, China

Received:2008-04-21 Online:2009-10-10 Published:2009-10-10
Contact: XIAO Jin-Xin. E-mail: xiaojinxin@pku.edu.cn
Supported by:
国家自然科学基金(批准号: 20573007)资助.

摘要/Abstract

摘要：

通过黏度、动态光散射和透射电镜方法研究了聚氧乙烯(PEO)对正负离子混合表面活性剂癸基磺酸钠(C₁₀SO₃)-癸基三乙基溴化铵(C₁₀NE)聚集体的影响. 实验结果表明, 加入PEO后, 非等摩尔C₁₀SO₃-C₁₀NE混合物的聚集体大小没有明显改变, 只有等摩尔混合物的聚集体发生了明显的长大, 且仍为囊泡, 说明PEO只对囊泡体系有显著的影响, 对胶团体系则没有明显的影响. 在接近等摩尔混合时, 混合体系中C₁₀SO₃与C₁₀NE过量程度相同的情况下, PEO对C₁₀NE过量的体系影响更大. PEO对囊泡体系的影响主要表现为PEO通过对囊泡的“空缺絮凝”作用(Depletion interaction)使囊泡长大, 而对于非等摩尔混合的胶团溶液, 由于胶团之间存在较强的静电排斥作用而无法发生聚集. PEO对C₁₀NE过量的体系影响更大, 主要是由于C10NE过量体系中的聚集体比C10SO3过量体系中的更接近于等摩尔组成.

关键词: 癸基磺酸钠; 癸基三乙基溴化铵; 聚氧乙烯; 胶束; 囊泡

Abstract:

The interactions of polyethylene oxide(PEO) with the mixtures of sodium decylsulfonate(C₁₀SO₃) and decyltriethylammonium bromide(C₁₀NE) were investigated by viscosity, dynamic light scattering and transmission electron microscopy techniques. It showed that PEO had no significant effects on the aggregate size of the non-equimolarly mixed cationic-anionic surfactants. Striking growth of the aggregates was observed only when the molar ratio of C₁₀NE to C₁₀SO₃ closed to equimolar, and those strikingly grown aggregates were still vesicles. Therefore, it can be concluded that PEO has striking effects only on vesicle-involved systems, whereas no significant effect on micellar systems. Around equimolar mixing ratio, PEO exhibited stronger influence on C₁₀NE-excessed systems than on C₁₀SO₃-excessed ones when the excess extents of C₁₀SO₃ and C₁₀NE are the same. The growth of vesicles induced by PEO could be explained in terms of depletion interaction between PEO and vesicles. The fact that PEO has no significant effect on non-equimolarly mixed micellar systems could be ascribed to the strong electrostatic repulsion between charged micelles. The stronger influence of PEO on C₁₀NE-excessed systems was ascribed to that the aggregates in C₁₀NE-excessed systems were closer to equimolar composition than those in C₁₀SO₃-excessed ones.

Key words: Sodium decylsulfonate; Decyltriethylammonium bromide; Polyethylene oxide; Micelle; Vesicle

TrendMD:

王晨, 严鹏, 肖进新. 聚氧乙烯与非等摩尔正负离子表面活性剂混合体系的相互作用. 高等学校化学学报, 2009, 30(10): 2012.

WANG Chen, YAN Peng, XIAO Jin-Xin*. Interaction of Polyethylene Oxide with Non-equimolarly Mixed Cationic-Anionic Surfactants. Chem. J. Chinese Universities, 2009, 30(10): 2012.

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