Enzymatic ring-opening polymerization of 2,2-dimethyltrimethylene carbonate catalyzed by PPL immobilized on silica nanoparticles |
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Authors: | Xiang-Hua Yu Jun Feng Jun Liao |
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Institution: | Key Laboratory of Biomedical Polymers, Ministry of education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China |
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Abstract: | Silica nanoparticles were first used as the carrier for the porcine pancreas lipase (PPL) immobilization. The result of transmission electron microscopy (TEM) showed that the immobilized lipase was still in nanosize after enzyme immobilization. The ring-opening polymerization of 2,2-dimethyltrimethylene carbonate (DTC) catalyzed by this immobilized PPL (IMPPL) was explored. 1H NMR spectra suggested no evidence of decarboxylation during propagation. Influences of IMPPL concentration and reaction temperature on the molecular weight and yield of poly(DTC) were studied. The recovery and reuse of IMPPL for the ring-opening polymerization of DTC was also investigated. The recycling IMPPL showed even higher catalytic activity and a higher molecular weight of polycarbonate could be achieved. |
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Keywords: | Polycarbonates Ring-opening polymerization Immobilized lipase Nanoparticles |
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