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Reactivity ratios for the copolymers isoprene (IP)-co-maleic anhydride (MAH) and isoprene (IP)-co-glycidyl methacrylate (GMA) are reported. Copolymers were prepared by free radical polymerization using benzoyl peroxide (BPO) as initiator at 70°C. These copolymers were characterized by FTIR and ¹H NMR. The monomer compositions in the copolymer were determined by ¹H NMR and the reactivity ratios (r_i) were calculated applying diverse linear methods, namely Finemann–Ross (FR), Inverted Finemann–Ross (IFR), Kelen–Tüdös (KT), Extended Kelen–Tüdös (EKT) and the nonlinear method of Tidwell–Mortimer (TM). By using the latter procedure, the values of the reactivity ratios were estimated as 0.119 and 0.248 for the system IP (1) and GMA (2) respectively; whereas for the IP and MAH system were 0.057 and 0.078 respectively. These values suggest the formation of nearly-alternating copolymers in both …