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Free‐radical copolymerization of vinyl pyrrolidone and acrylamide was performed in water at 60°C. Their copolymerization reactions were continued up to high conversions and reaction mixture sampled sequentially during the reaction. The compositions of the aliquots were measured by UV spectroscopy, and their polymer contents were obtained by gravimetry. Data are evaluated by a recent error in variables method developed for sequential sampling. Reactivity ratios are found as rA = 2.03 ± 0.14, rVP = 0.09 ± 0.02. Analysis of the data up to 45% conversion by the Extended Kelen Tüdös method gave consistent results.
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Akyüz et al. (2006) studied this question.
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