Abstract
The composition and monomer unit sequence distributions of copolymers of styrene with citraconic (α-methylmaleic) anhydride (CA) prepared in methyl ethyl ketone at 50.0±0.1°C have been determined over a range of comonomer feed mole fractions using 13C n.m.r. spectroscopy. The monomer units in these copolymers were found to display an increasingly strong tendency to alternate as the mole fraction of CA in the feed increased. The terminal, penultimate, complex-participation and complex-dissociation models were each tested for applicability to the mechanism of copolymerization for this comonomer system by applying reactivity ratio related test functions to the experimental sequence distribution data, enabling a direct visual assessment of the applicability of each model to be made. On the basis of these test functions, the terminal, penultimate and complex-dissociation models were each found to provide inadequate descriptions of this copolymerization system.
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