SURFACE ACTIVITY AND EMULSIFICATION PROPERTIES OF SURFACTANTS DERIVED FROM NONYLPHENOL ETHOXYLATED, ETHYLENE OXIDE AND CARBON DIOXIDE

• Published in: Journal of dispersion science and technology Vol. 18; no. 1; pp. 1 - 9
• Main Authors: Ovalles, C., Marquez, R. L., Lujano, E., Aular, W., Curci, R., Portillo, J.
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 01.01.1997; Taylor & Francis
• Subjects: Chemistry; Colloidal state and disperse state; Emulsions. Microemulsions. Foams; Exact sciences and technology; General and physical chemistry; Surface physical chemistry; Surface-active agents: properties; Base catalysis; Emulsification; Oil water emulsion; Non ionic surfactant; Preparation; Carbon dioxide; Ethylene oxide; Experimental study; Surface activity
• ISSN: 0193-2691; 1532-2351
• DOI: 10.1080/01932699708943713

The synthesis of new water soluble nonylphenol poly(ethylene carbonate) surfactants derived from nonylphenol ethoxylated (NP(EO) 10 ), ethylene oxide (EO), and carbon dioxide was carried out in high yields in the presence of K 2 SnO 3 as a basic catalysts. Synthesis reactions were carried out in a stainless-steel reactor at 175°C at an initial pressure of 800 psi for a 24 h-period. Surfactants were characterized by FTTR, 1 H- and 13 C-NMR. The percentages of carbon dioxide incorporation obtained were between 5.8 and 10.9, depending on the starting molar ratio of NP(EO) 10 :EO:CO 2 . CMC values, as well as cloud points decreased with the molar ratio CO 2 /EO, indicating a reduction of hydrophilic character of the surfactants due to the addition of carbonate groups, O-C(=O)-O, into the ethoxylated chains. Also, the area per molecule at die interface increased when molar ratio CO 2 /EO increased, indicating a two site anchoring model for both hydrophobic moieties, poly(ethylene carbonate) chain and nonylphenol. Finally, nonylphenol poly(ethylene carbonate) surfactants showed good emulsification properties for stabilizing sunflower oil in water emulsions.