The N-[4-methyl phenyl) maleimide (MPM) was prepared by maleic anhydride and 4-Toludin. It was homo polymerized and copolymerized with methyl acrylate (MA) in order to study the effect of imide ring in polymer backbone. The homo and copolymerization were carried out in different time and solvent initiator system. The molecular weight was determined by gel permeation chromatography (GPC).The intrinsic viscosity and solubility were determined to characterize the polymers. The structure was elucidated by FT-IR and 1HNMR spectral studies. The thermal behavior was studied by thermo gravimetric analysis. The initial decomposition temperature of polymer was 224° C.