Lulu Han, Yongming Zhang, Hong Li
Feb 20, 2009
Citations
0
Influential Citations
12
Citations
Journal
Colloids and Surfaces A: Physicochemical and Engineering Aspects
Abstract
Abstract A series of perfluoro-2,5-dimethyl-3,6-dioxanonanoic acid ester fluorocarbon surfactants, CF 3 CF 2 CF 2 OCF(CF 3 )CF 2 OCF(CF 3 )COOC n H 2 n +1 (C 9 F 17 O 4 –C n H 2 n +1 : n = 8, 12, 16, 18), were synthesized by esterification of 2,3,3,3-tetrafluoro-2-(1,1,2,3,3,3-hexafluoro-2-(heptafluoropropyloxy)-propoxy)-propionic acid fluoride with 1-octanol, 1-dodecanol, 1-hexadecanol and 1-octadecanol, respectively. The structures of C 9 F 17 O 4 –C n H 2 n +1 ( n = 8, 12, 16, 18) were extensively characterized by FT-IR, 1 H NMR and 19 F NMR. The results of study on the surface activities show they have low surface tension and can significantly reduce the surface tensions of organic solvents by 40–83%. Besides, the critical micelle concentrations of these surfactants in solvents with different polarities have been identified at 18 °C. Furthermore, the surface excess concentrations and the effective cross-section areas of C 9 F 17 O 4 –C n H 2 n +1 in cyclohexane have been analyzed in detail. The arrangements of these surfactants at the air/solvent interface were speculated thereby.