CATIONIC SURFACTANTS WITH PERFLUOROCARBOXYLATES AS COUNTERION - SOLUBILITY AND MICELLE FORMATION

被引:29
作者
SUGIHARA, G
NAGADOME, S
YAMASHITA, T
KAWACHI, N
TAKAGI, H
MOROI, Y
机构
[1] KYUSHU UNIV 33,FAC SCI,DEPT CHEM,HIGASHI KU,FUKUOKA 812,JAPAN
[2] FUKUOKA UNIV,FAC SCI,DEPT CHEM,JONAN KU,FUKUOKA 81401,JAPAN
来源
COLLOIDS AND SURFACES | 1991年 / 61卷
关键词
D O I
10.1016/0166-6622(91)80303-6
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The aqueous solubility and critical micelle concentration (CMC) of dodecyl-ammonium perfluorocarboxylates (trifluoroacetate, pentafluoropropionate, and heptafluorobutyrate) were measured, and the effects of the extent of hydrophobicity of counterion on solubility, CMC, and the Krafft point (the micelle temperature range, (MTR) were examined. The aqueous solubilities were smaller than those of ionic surfactants with the same dodecyl chain, and the enthalpy changes of dissolution into aqueous media, while positive, were also reduced. The Krafft point of the butyrate was too high to be determined. From the dependence of CMC on counterion concentration, the degrees of counterion association to micelle were deduced to be 0.83-0.93 for acetate ion and 0.98-1 for propionate ion. These higher values resulted in their lower CMC values. Thermodynamic parameters for micelle formation indicated substantial differences in micellar structure between acetate and butyrate counterions.
引用
收藏
页码:111 / 121
页数:11
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