Ethyl acrylate (EA) and n‐butyl methacrylate (n‐BMA) copolymers were prepared in solution and the composition of the copolymer samples was estimated by 1H‐NMR spectroscopic techniques. Because the characteristic signals, which vary with the composition of the copolymer, were absent, the ratio of intensities of down‐field protons to that of the total protons was used for the estimation of copolymer composition. Reactivity ratios were calculated from these values by using the Kelen‐Tudos differential linear equation.
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