期刊
PROCESS BIOCHEMISTRY
卷 46, 期 10, 页码 1993-2000出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2011.07.008
关键词
Lipase; Polyester; Candida sp.99-12; Polymerization; Diethyl sebacate; 1,4-Butanediol
资金
- National Nature Science Foundation of China [20876011, 20876012]
- Natural Science Foundation of Beijing, China [2071002]
- 863 program [2007AA100703, 2009AA03Z232, 2009AA02Z207]
- 973 program [2007CB714304, 2009CB724703, 2011CB200905, 2011CB710800]
- Beijing Municipal Science and Technology Commission [Z09010300840901]
- Key Projects in the National Science & Technology Pillar Program [2008BA163B07]
- Ministry of Education of China [704010]
- Scientific Research Foundation of Graduate School of Beijing University of Chemical and Technology
A novel lipase-catalyzed synthesis of aliphatic polyesters has been achieved successfully by using Candida sp.99-125 with diethyl sebacate and 1,4-butanediol as starting substrates in absence of organic solvents. The lipase from Candida sp.99-125 was employed for the first time to catalyze synthesis of poly(butylene sebacate) and showed high catalytic activity for bulkpolymerization under mild reaction conditions. The eco-friendly processes, without any environmental pollution, avoided both phase separation of the reactants and the use of toxic solvents effectively. The polycondensation reactions were performed in two stages: first stage reaction under atmospheric pressure to convert the monomers to oligomers followed by second stage reaction under vacuum process, with a highest molecular weight of 15,800 obtained in molar ratio of 1:1 at 70 degrees C. The corresponding polyesters determined by thermogravimetric analysis (TGA) were much thermally stable up to 300 degrees C. Differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXS) analysis demonstrated the polymers had a strong ability to crystallize with the degree of crystallinity up to 66%. (C) 2011 Elsevier Ltd. All rights reserved.
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