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DEVELOPMENT OF OXYGENATED HYDROCARBON-BASED CO2- SOLUBLE POLYMERS - Using CO2 as a Green Solvent
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Recently the use of §sub/supercritical CO2 has received much attention as §a green alternative to organic solvents for chemical §processes because of its pressure-tunable §physicochemical properties and economic advantages. §But, the advantages are diminished because of a §narrow range of CO2-soluble materials. The goal of §this work is to identify and design oxygenated §hydrocarbon-based CO2-soluble polymers that are able §to serve as construction blocks for CO2 soluble §materials. Without concerning on the cost and the §environmental persistence like fluorinated materials, §the inexpensive and environmentally benign materials §would significantly enhance the viability of §CO2-based technology. We proposed §specific new polymer structures: poly (3-acetoxy §oxetane), poly (vinyl methoxymethyl ether), and §cellulose triacetate oligomers. Phase behavior §studies were also performed with CO2-philic compounds §containing vinyl acetate, propylene glycol, or tert-§butyl groups. New non-fluorous CO2-soluble materials §were identified, which were acetate-rich with §flexible chains, weak self-interactions, and §multidentate interaction between CO2 and the §functional groups.
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