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Abstract
The free radical copolymerization of 4-nitrophenyl methacrylate (NPMA) with methylmethacrylate (MMA) in 2-butanone was carried out with different mole ratios of NPMA and MMA. The resulting copolymers were characterized by spectral studies. The molecular weights of the copolymers were determined by gel permeation chromatography and both number average (Mn) and weight average (Mw/ molecular weights lie in the range of 1.7–1.9 × 104 and 3.2–3.6 × 104, respectively. The copolymer composition was evaluated by 1H NMR spectroscopic technique. The reactivity ratios of the monomers in the copolymer were calculated by Fineman-Ross, Kelen-Tudos and extended Kelen-Tudos methods. The product of these values are close to each other (0.73–0.80) and suggest a random arrangement of monomers in the copolymer chain. Thermal properties of these systems investigated by TG and DSC indicate that the decomposition of all the copolymers occurs in the temperature range 175°C–535°C.
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