Three series of biodegradable unsaturated polyesters containing hydroxybenzoic acid with different ratios and maleic anhydride as a site of unsaturation were synthesized in the presence of several aliphatic acids. Their chemical structures were confirmed via IR and 13 CNMR spectroscopy. Curing exotherms of the unsaturated polyesters with styrene so prepared were determined at several temperatures. Effects of hydroxybenzoic acid content and the percentage of maleic anhydride on the synthesis, structure, curing and mechanical properties and hydrolytic degradation are reported.

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