THERMODYNAMIC PROPERTIES OF AQUEOUS-SOLUTIONS OF PERFLUORINATED IONIC SURFACTANTS

被引：17
|
作者：
TOMASIC, V
CHITTOFRATI, A
KALLAY, N
机构：
[1] UNIV ZAGREB,FAC SCI,PHYS CHEM LAB,ZAGREB 10001,CROATIA
[2] RUDJER BOSKOVIC INST,DEPT CHEM PHYS,ZAGREB 10001,CROATIA
[3] CRS,COLLOID LAB,I-20021 BOLLATE,ITALY
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 1995年 / 104卷 / 01期
关键词：
ENTHALPY; HEAT CAPACITY CHANGE; PERFLUORINATED SURFACTANTS; PERFLUOROPOLYETHER SURFACTANTS; SOLUBILITY;
D O I：
10.1016/0927-7757(95)03260-K
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 enthalpies of dissolution of perfluorooctanoic acid, a perfluoropolyether carboxylic acid and their sodium salts were measured as a function of temperature. The heat capacity changes (Delta C-p) were obtained from the slope of enthalpy vs. temperature plot. The values of Delta C-p for perfluorooctanoic acid and its sodium salt are higher than those of the corresponding hydrogenated compounds and are accompanied by lower critical micellization concentrations. The finding is explained on the basis of the higher hydrophobicity of perfluorinated compounds. Perfluoropolyether carboxylic acid and its sodium salt showed relatively lower Delta C-p values which may be due to the branching or the presence of oxygen in the chain. Measurements of the heat capacity change serve also for the explanation of the temperature dependency of the solubility of surfactants.
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页码：95 / 99
页数：5
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