This study is related to the investigation of the chemical fixation of carbon dioxide to copolymer bearing cyclic carbonate group and their application to polymer blends. Poly [GMA(glycidyl methacrylate)-AN(acrylronitrile)] was converted to poly[DOMA[(2-oxo-1,3-dioxolane-4-yl) methyl methacrylate]-AN(acrylronitrile)] by the polymer reaction with carbon dioxide using tetraoctyl ammonium chloride(TOAC) as a catalyst. The miscibility behavior of various poly(DOMA-AN) with PEI blend was studied using differential scanning calorimeter(DSC). Optical clarity test and DSC analysis showed that poly(DOMA-AN) blends were miscible over the whole composition ranges with PEI.