Abstract
Abstract The radical copolymerization of styrene (St, M1) with 3(2-methyl)-6-methylpyridazinone (I, M2) has been carried out in several p-substltuted phenols at 60 and 70°C. Monomer reactivity ratios (r1) and activation parameters of copolymerization were found to be affected by phenols. The values of the activation energy (δδE‡) and entropy (δδS‡) increased with the increase of the interaction of I with the solvents. Linear relationships were observed between the [sgrave]-values of p-substituents of phenols and the values of log 1/r1 and also of δδE‡ and δδS‡. The radical copolymerization of St (M1) with 6-substituted 3(2-methyl)-pyridazinone was also carried out.
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