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首页> 外文期刊>Journal of Applied Polymer Science >Lipase-catalyzed synthesis of hyperbranched polyester improved by autocatalytic prepolymerization process
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Lipase-catalyzed synthesis of hyperbranched polyester improved by autocatalytic prepolymerization process

机译：通过自催化预聚合过程改善了脂肪酶催化的超支化聚酯的合成

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摘要

This work developed a facile and environmentally friendly route for lipase-catalyzed synthesis of a hyperbranched polyester by introducing an autocatalytic prepolymerization of comonomers. Trimethylolpropane, 1,8-octanediol, and adipic acid as comonomers for synthesizing the hyperbranched polyester were first prepolymerized via the automatic catalytic effect of the reactants themselves to obtain an appropriate reaction substrate for further lipase-catalyzed polymerization, where immobilized lipase Novozym 435 was used as a biocatalyst. The acidity and fluidity of optimized oligomers after the autocatalytic prepolymerization provide a benign reaction substrate for the retention of enzymatic activity in the subsequent lipase-catalyzed esterification, which is crucial for the enzymatic polymerization. The optimum reaction temperature and reaction time for prepolymerization were determined to be 120 degrees C and 150 min. The molecular weight (M-w) of the prepared polyester was approximately 26,300 g/mol. Quantitative analysis of H-1-NMR and inverse-gated C-13-NMR spectra confirmed the hyperbranched structure of the resulting polyester with a branching degree of 31.3%. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47221.
机译：这项工作通过引入共聚单体的自催化预聚合，开发了一种容易和环保的脂肪酶催化合成的超支化聚酯的合成。作为合成超支化聚酯的共聚单体的三羟甲基丙烷，1,8-辛醇和己二酸首先通过反应物本身的自动催化作用，得到适当的反应基质，用于进一步脂肪酶催化聚合，其中使用固定化的脂肪酶Novozym 435作为生物催化剂。在自催化预聚合后优化低聚物的酸度和流动性提供了良性反应基质，用于在随后的脂肪酶催化酯化中保留酶活性，这对于酶聚合至关重要。确定最佳反应温度和预聚合的反应时间为120℃和150分钟。制备聚酯的分子量（M-W）约为26,300g / mol。 H-1-NMR和逆门C-13-NMR光谱的定量分析证实了所得聚酯的超支化结构，分支度为31.3％。 （c）2018 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47221。

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