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Abstract
Cloud-point data demonstrate that ethyl and butyl methacrylate (EMA and BMA) cosolvents reduce the conditions needed to solubilize poly(ethyl methacrylate) (PEMA) and poly(butyl methacrylate) (PBMA) in CO 2 . Although PEMA does not dissolve in CO 2 to temperatures of 250 °C and pressures of 2500 bar, PEMA dissolves in CO 2 at temperatures below 150 °C and pressures below 1000 bar if ∼10 wt % EMA cosolvent is used. The PEMA-CO 2 -EMA and PBMA-CO 2 -BMA cloud-point curves are shifted below 40 °C and 600 bar with ∼30 wt % methacrylate (MA) cosolvent; however, the impact of the cosolvent diminishes as its concentration increases. BMA and EMA provide favorable polar interactions with the MA groups in the polymer, they increase the solvent density which magnifies the strength of polymer-cosolvent interactions, and they reduce the free-volume difference between the polymer and the solvent. The phase behavior of the binary CO 2 -EMA and CO 2 -BMA systems is also reported.
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