Journal
ULTRASONICS SONOCHEMISTRY
Volume 31, Issue -, Pages 506-511Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2016.02.005
Keywords
Ultrasound; Lipase; Solvent-free synthesis; Poly (ethylene glutarate); Kinetics
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Funding
- Portuguese Foundation for Science and Technology (FCT) [UID/BIO/04469/2013, POCI-01-0145-FEDER-006684]
- Bioprocess and Bionanotechnology Research Group (BBRG) of Minho University
- Jiangnan University
- Department of Science and Technology
- Portuguese Science Foundation
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The present work explores the best conditions for the enzymatic synthesis of poly (ethylene glutarate) for the first time. The start-up materials are the liquids; diethyl glutarate and ethylene glycol diacetate, without the need of addition of extra solvent. The reactions are catalyzed by lipase B from Candida antarctica immobilized on glycidyl methacrylate-ter-divinylbenzene-ter-ethylene glycol dimethacrylate at 40 degrees C during 18 h in water bath with mechanical stirring or 1 h in ultrasonic bath followed by 6 h in vacuum in both the cases for evaporation of ethyl acetate. The application of ultrasound significantly intensified the polyesterification reaction with reduction of the processing time from 24 h to 7 h. The same degree of polymerization was obtained for the same enzyme loading in less time of reaction when using the ultrasound treatment. The degree of polymerization for long-term polyesterification was improved approximately 8-fold due to the presence of sonication during the reaction. The highest degree of polymerization achieved was 31, with a monomer conversion of 96.77%. The ultrasound treatment demonstrated to be an effective green approach to intensify the polyesterification reaction with enhanced initial kinetics and high degree of polymerization. (C) 2016 Elsevier B.V. All rights reserved.
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