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Isopropenyl isocyanate was copolymerised with methyl acrylate and styrene. The reactivity ratios r1 and r2 are calculated: methyl acrylate — isopropenyl isocyanate r1 = 0.8r2 = 0.08. styrene — isopropenyl isocyanate r1 — 7r2 — 0.14. These results are discussed according to the theory of Alfrey and Price. The isocyanate group acts as an electron donor. This is in agreement with the mesomeric structures usually assigned to the aliphatic isocyanates.
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Hart et al. (1956) studied this question.
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