Abstract
Reaction mixtures originating in the synthesis of unsaturated polyesters from maleic anhydride and isobutylene oxide were analysed by 1H and 13C NMR. The contents of unreacted isobutylene oxide and of several side products in the reaction mixture, and the concentrations of isobutylene and maleic acid structural units in the oligoester chain were determined quantitatively at different stages of the process. Four reactions were found to proceed during the synthesis of the polyester: isomerization of isobutylene oxide to isobutyral, its condensation with isobutylene oxide to a cyclic acetal, homopolymerization and copolymerization of isobutylene oxide.
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