Abstract
The copolymerization of l-lactic acid (LA) and δ-valerolactone (VL) was performed in the presence of water without catalysts at 200° under nitrogen. The reaction proceeds by direct condensation between linear LA and linear 5-hydroxyvaleric acid formed by hydrolysis of the cyclic VL. The copolymers were characterized with respect to composition by means of 1H-NMR spectra, their sequences by means of 13C-NMR spectra, and their crystallinities by means of DSC and X-ray measurements. The LA/VL molar ratios in the copolymers agree well with the average lengths of the homogeneous lactyl/δ-oxyvaleryl blocks. From the result of 13C-NMR spectroscopy, it was found that sequential copolymers with suitable block lengths of lactyl and δ-oxyvaleryl units can be obtained by controlling the molar ratio. The DSC measurements show a close relationship between the nature of sequences and the crystallinity.
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