| 초록 |
Experimental cloud-point data to temperature of 250 oC and pressure of 2800 bar are presented for ternary mixtures of poly(cyclohexyl acrylate)-CO2-cyclohexyl acrylate and poly(cyclohexyl methacrylate)-CO2-cyclohexyl methacrylate systems. Cloud-point pressures of poly(cyclohexyl acrylate)-CO2-cyclohexyl acrylate system is measured in the temperature range of 40 oC to 180 oC and to pressures as high as 2200 bar with cyclohexyl acrylate concentration of 22.5, 27.4, 33.2, and 39.2 wt.%. It shows that adding 45.6 wt.% cyclohexyl acrylate to the poly(cyclohexyl acrylate)-CO2 mixture significantly changes the phase behavior. This system changes the pressure-temperature slope of the phase behavior curves from UCST region to LCST region as the cyclohexyl acrylate concentration increases. Also, the ternary poly(cyclohexyl methacrylate )-CO2-cyclohexyl methacrylate system is measured below 185 oC and 2300 bar, and with cosolvent of 27.4 ~ 46.7 wt%. Also, when 53.5 wt% cyclohexyl methacrylate is added to the poly(cyclohexyl methacrylate )-CO2 solution, the cloud-point curve shows the typical appearance of a LCST boundary. |
