This study was related to the investigation of the chemical fixation of carbon dioxide to a copolymer bearing epoxide and the application of the cyclic carbonate group containing copolymer-to-polymer blends. In the synthesis of poly[(2-oxo-1,3-dioxolane-4-yl) methyl methacrylate-co-ethyl acrylate] [poly(DOMA-co-EA)] from poly(glycidyl methacrylate-co-ethyl acrylate) [poly(GMA-co-EA)] and CO2, quaternary ammonium salts showed good catalytic activity. The films of poly(DOMA-co-EA) with poly(methyl methacrylate) (PMMA) or poly(vinyl chloride) (PVC) blends were cast from N,N'-dimethylformamide solution. The miscibility of the blends of poly(DOMA-co-EA) with PMMA or PVC have been investigated both by DSC and visual inspection of the blends. The optical clarity test and DSC analysis showed that poly(DOMA-co-EA) containing blends were miscible over the whole composition range. The miscibility behaviors were discussed in terms of Fourier transform infrared spectra and interaction parameters based on the binary interaction model.