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Synthesis of aliphatic polyesters has been examined using  Candida  antarctica  lipase in supercritical carbon dioxide (scCO 2 ). The enzymatic ring-opening polymerization of ε-caprolactone (ε-CL) proceeded in scCO 2  to give a polymer with molecular weight higher than 104. Effects of reaction parameters such as the monomer concentration, enzyme amount and pressure have been systematically investigated. Copolymerization of ε-CL with 12-docecanolide afforded the random copolymer. The enzymatic polycondensation of divinyl adipate and 1,4-butanediol also proceeded in scCO 2  to produce the corresponding polyester.

Lipase-catalyzed synthesis of aliphatic polyesters in supercritical carbon dioxide