Pressure-composition isotherms are obtained for the carbon dioxide + 2,2,3,3,4,4,5,5-octafluoropentyl acrylate (OFPA) and carbon dioxide + 2,2,3,3,4,4,5,5-octafluoropentyl methacrylate (OFPMA) systems using a static apparatus at a temperature range from (313.2 to 393.2) K and pressures up to 17.86 MPa. The solubility of OFPA and OFPMA for the (carbon dioxide + OFPA) and (carbon dioxide + OFPMA) systems increases as the temperature increases at constant pressure. Liquid-liquid-vapor equilibria for the (carbon dioxide + OFPA) and (carbon dioxide + OFPMA) systems were not observed at these conditions. We determined new parameters for the critical constants by using the Joback, modified Joback, and Constantinou-Gani group contribution methods. The acentric factor was determined by using Ambrose and Walton's method. Using these parameters, the experimental results for (carbon dioxide + OFPA) and (carbon dioxide + OFPMA) systems are correlated with the Peng-Robinson equation of state (EOS) using a van der Waals one-fluid mixing rule including two adjustable parameters. We compared the three Joback, modified Joback, and Constantinou-Gani group contribution methods.