Abstract
Glycolic acid (GA) was copolymerized with various lactones such as γ-butyrolactone (BL), δ-valerolactone (VL) and ϵ-caprolactone (CL) in the presence of water without catalysts at 200°C under N 2, giving relatively low molecular weight polyesters. This reaction is characterized by direct condensation between linear GA and linear ω-hydroxy acids produced by hydrolysis of the cyclic lactones, e.g. 4-hydroxybutyric acid (HBA) for the cyclic BL, 5-hydroxyvaleric acid (HVA) for the cyclic VL, and 6-hydroxycaproic acid (HCA) for the cyclic CL. 1H-NMR spectroscopy showed that GA reacts quantitatively with HVA and HCA, in contrast to low reactivity for HBA.
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