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- W2078500684 abstract "The copolymerization of epsilon-caprolactone (epsilon-CL) and d,l-lactide catalyzed by Candida antarctica lipase B was studied. Copolymerizations with different epsilon-CL-to-lactide ratios were carried out, and the product was monitored and characterized by MALDI-TOF MS, GPC, and (1)H NMR. The polymerization of epsilon-CL, which is normally promoted by C. antarctica lipase B, is initially slowed by the presence of lactide. During this stage, lactide is consumed more rapidly than epsilon-CL, and the incorporation occurs dimer-wise with regard to the lactic acid (LA) units. As the reaction proceeds, the relative amount of CL units in the copolymer increases. The nonrandom copolymer structure disappears with time, probably due to a lipase-catalyzed transesterification reaction. In the copolymerizations with a low content of lactide, macrocycles of poly(epsilon-caprolactone) and copolymers having up to two LA units in the ring were detected." @default.
- W2078500684 created "2016-06-24" @default.
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- W2078500684 date "2003-06-06" @default.
- W2078500684 modified "2023-09-23" @default.
- W2078500684 title "Structural Characterization of a Lipase-Catalyzed Copolymerization of ε-Caprolactone and <scp>d</scp>,<scp>l</scp>-Lactide" @default.
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- W2078500684 doi "https://doi.org/10.1021/bm0340725" @default.
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