Two types of copolymers based on 2-methylbenzyl methacrylate and 4-methylbenzyl methacrylate with methyl methacrylate were synthesized. Several copolymers of 2-methylbenzyl methacrylate (2-MBZMA) and 4-methylbenzyl methacrylate (4-MBZMA) with methyl methacrylate (MMA) having different copolymer compositions were performed in 1,4-dioxane using 2,2'-azobisisobutyronitrile (AIBN) as a free radical initiator at 60 +/- 1degreesC. The copolymers were characterized by FT-IR, H-1- and C-13-NMR spectroscopic techniques. The composition of monomeric units in the copolymer system was calculated using H-1-NMR spectroscopy by comparing the integral values of well separated aromatic and aliphatic proton peaks. The reactivity ratios were calculated by employing Fineman-Ross and Kelen-Tudos methods. The values of r(1) and r(2) obtained by the Fineman-Ross and Kelen-Tudos methods appear to be in close agreement with each other, i.e,, r(1)(2-MBZMA):1.03 +/- 0.039 and r(2)(MMA): 0.77 +/- 0.012 for the copoly(2-MBZMA-MMA) system, r(1)(4-MBZMA): 0.97 +/- 0.040 and r(2)(MMA):0.77 +/- 0.050 for the copoly(4-MBZMA-MMA) system.