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The kinetics of the copolymerization of N‐isopropylacrylamide (NiPAAm) and diethylene glycol monomethylether monomethacrylate was followed by online 1H NMR spectroscopy. Two copolymerization reactions were sufficient to evaluate the kinetic data with the Extended‐Kelen–Tüdös method as well as the nonlinear least square method. The copolymerization parameter was determined as rNiPAAm = 0.70 and rDEGMA = 2.0. The higher reactivity of the methacrylate compared to the NiPAAm is in good agreement with other kinetic data of similar systems. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 142–148, 2005