The physicochemical property for the P(MMA-co-PnFPA) using the ratio of MMA vs PnFPA and AIBN content was investigated. Cloud-point data up to 453 K and 220 MPa are reported for the P(MMA-co-PnFPA) in supercritical solvents. Phase behavior for the P(MMA-co-PnFPA) + CH2F2, CHF3 and CHClF2 mixtures are measured in UCST or LCST behavior.