Abstract
Radical polymeriiations of seven dialkyl itaconates (DRIs) with methyl, isopropyl, or tert-butyl ester groups were carried out with dimethyl 2,2'-azobis(isobutyrate) in benzene at 60°C. The effects of the α- and β-ester alkyl substituents of the DRIs on the polymerization rate (R p ) and the propagation and termination'rate constants (k p and k t ) were examined. For a-substitution R p decreased with increasing bulkiness of the alkyl group, whereas the opposite was observed for β-substitution. ESR data revealed that K p decreases with bulkiness of the α-ester alkyl group in the order methyl> isopropyl> t-butyl
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