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Polymers 2016, 8(10), 363;

Highly Branched Bio-Based Unsaturated Polyesters by Enzymatic Polymerization

Danish Polymer Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
Hempel A/S, Lundtoftegårdsvej 91, DK-2800 Kgs. Lyngby, Denmark
Author to whom correspondence should be addressed.
Academic Editor: Katja Loos
Received: 14 September 2016 / Revised: 7 October 2016 / Accepted: 10 October 2016 / Published: 14 October 2016
(This article belongs to the Special Issue Enzymatic Polymer Synthesis)
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A one-pot, enzyme-catalyzed bulk polymerization method for direct production of highly branched polyesters has been developed as an alternative to currently used industrial procedures. Bio-based feed components in the form of glycerol, pentaerythritol, azelaic acid, and tall oil fatty acid (TOFA) were polymerized using an immobilized Candida antarctica lipase B (CALB) and the potential for an enzymatic synthesis of alkyds was investigated. The developed method enables the use of both glycerol and also pentaerythritol (for the first time) as the alcohol source and was found to be very robust. This allows simple variations in the molar mass and structure of the polyester without premature gelation, thus enabling easy tailoring of the branched polyester structure. The postpolymerization crosslinking of the polyesters illustrates their potential as binders in alkyds. The formed films had good UV stability, very high water contact angles of up to 141° and a glass transition temperature that could be controlled through the feed composition. View Full-Text
Keywords: enzymatic synthesis; one pot synthesis; highly branched polyesters; pentaerythritol; crosslinkable polyesters; controlled glass transition temperature enzymatic synthesis; one pot synthesis; highly branched polyesters; pentaerythritol; crosslinkable polyesters; controlled glass transition temperature

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Nguyen, H.D.; Löf, D.; Hvilsted, S.; Daugaard, A.E. Highly Branched Bio-Based Unsaturated Polyesters by Enzymatic Polymerization. Polymers 2016, 8, 363.

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