Novel polyesteramides were synthesized by copolymerization in bulk of 5-(4,5-dihydro-1,3-oxazol-2-yl)-1-pentanol and various cyclic dicarboxylic acid anhydrides at temperatures varying between 120 and 200 degrees C. The polymers resulting from polycondensation were characterized by means of H-1-NMR, FTIR, MALDI-TOF-MS, SEC, and DSC. The glass transition temperatures, T-g, of the copolymers were varied between -28 and +31 degrees C as a function of the anhydride type. Molecular weights, M-w, were dependent on reaction temperature, reaction time, and anhydride type. Spectroscopic investigation of reaction products and esteramide model compounds provided evidence for imide by-product formation, which accounts for the low degree of polymerization.