Phase behavior and stability of perfluorinated homopolymer surfactant/water/carbon dioxide system

摘要

Perfluorinated homopolymers, poly(heptadecafluorodecyl acrylate) (poly(HDFDA)), poly(heptadecafluorodecyl methacrylate) (poly(HDFDMA)) and ((perfluorooctyl)ethylthio)methyl-substituted poly(oxyethylene) (H2F8TP) were proposed as surfactants in water-in-carbon dioxide (W/C) microemulsion. To confirm possibility as surfactants in W/C microemulsion, we carried out phase behavior measurement using variable volume view cell for surfactant + H2O + CO2 system with varying molar ratios of water to surfactant (wo). Cloud point studies confirmed that optically transparent and thermodynamically stable reverse micelles solutions were formed with the perfluorinated homopolymer surfactants. And dispersion polymerization of PMMA, PVP and PVCL was performed in scCO2 using poly(HDFDA), poly(HDFDMA) and H2F8TP as surfactant to find out relation and difference of role as surfactants in W/C microemulsion and in dispersion polymerization, respectively.