Abstract
Enzymatic degradation of poly(e-caprolactone) has been successfully carried out in supercritical carbon dioxide (scCO 2 ). Candida antarctica lipase smoothly catalyzed the hydrolytic degradation in scCO 2 to give oligo(e-caprolactone). The degradation in the presence of acetone (5 vol.-%) produced the oligomer of smaller molecular weight (less than 500) compared to that prepared without the additive. Matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrometry analysis showed that the degradation product was of a mixture of linear and cyclic oligomers. The addition of a very small amount of water also promoted the degradation of the polyester.
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