共 32 条
Enzymatic Ring-Opening Polymerization of ε-Caprolactone by Yarrowia lipolytica Lipase in Ionic Liquids
被引:29
作者:
Barrera-Rivera, Karla A.
[1
]
Marcos-Fernandez, Angel
[2
]
Vera-Graziano, Ricardo
[3
]
Martinez-Richa, Antonio
[1
]
机构:
[1] Univ Guanajuato, Dept Quim, Guanajuato 36050, Gto, Mexico
[2] CSIC, Inst Ciencia & Tecnol Polimeros, Dept Quim & Tecnol Elastomeros, E-28006 Madrid, Spain
[3] Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
关键词:
ionic liquids;
lipase;
ROP (ring-opening polymerization);
Yarrowia lipolytica;
CATALYZED POLYMERIZATION;
POLYESTER SYNTHESIS;
BIOCATALYSIS;
KINETICS;
MONOMERS;
D O I:
10.1002/pola.23623
中图分类号:
O63 [高分子化学(高聚物)];
学科分类号:
070305 ;
080501 ;
081704 ;
摘要:
Yarrowia lipolytica (YLL), Candida rugosa (CRL), and porcine pancreatic lipase (PPL) were employed successfully as catalysts in the enzymatic ring-opening polymerization (ROP) of epsilon-caprolactone in the presence of 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]), 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), 1-butylpyridinium tetrafluoroborate ([BuPy][BF4]), 1-butylpyridinium trifluoroacetate ([BuPy][CF3COO]), 1-ethyl-3-methylimidazolium nitrate ([EMIM][NO3]) ionic liquids. Poly(epsilon-caprolactone)s (PCLs) with molecular weights (M-n) in the range of 300-9000 Da were obtained. H-1- and C-13-NMR analyses on PCLs formed by YLL, CRL, and PPL showed asymmetric telechelic alpha-hydroxy-omega-carboxylic acid end groups. Differences between CP-MAS and MAS spectra are observed and discussed in terms of morphology. MALDI-TOF spectra show the formation of at least seven species. Differential scanning calorimetry (DSC) and Wide Angle X-Ray Scattering (WAXS) results demonstrate the high degree of crystallinity present in all the polyesters. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5792-5805, 2009
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页码:5792 / 5805
页数:14
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