| 초록 |
Carbon dioxide (CO2) has been regarded as a useful chemical having many advan- tages that it is cheap, nonflammable, nontoxic, inexpensive, chemically inert, recyclable, and readily accessible to supercritical region(TC=31oC, PC=7.38MPa), but the other hand CO2 which is nonpolar also regarded as a poor solvent because the solubility of polar chemicals in CO2 is low. Recently, the researches to solve this disadvantage of CO2 are lively carried out by many chemists and engineers. One of these is the research about the formation of emulsion that polar chemicals of nano(nm) or micro(μm) size droplets in diameter were dispersed in CO2. It is desired that many polar chemicals will be soluble in CO2 to reduce the interfacial tension between two types of chemicals by a proper surfactant. In this study, we synthesized the fluorocarbon-hydrocarbon(F-H) hybrid nonionic surfactants, the sodium salt of bis (2,2,3,3,4,4,5,5-octafluoro-1-pentanol) sulfosuccinate (di-HCF4), and the sodium salt of bis (3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro- octyl)-2-sulfosuccinate(di-HCF7) with with both 'CO2 philic' chain and 'hydrophilic' chain and form water(polar) in CO2 (nonpolar) emulsion by using these surfactants. We confirmed the two surfactants were soluble in CO2 as well as water by measurement of surfatant and compared the degree of the solubility between them. The surfactants synthesized were characterized by 1H NMR, 13C NMR, 19F NMR and DEPT NMR analysis.
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