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Wednesday, 18 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Sustainable coatings from bio-based polyesters with enhanced functionalities

Wednesday, 9 November 2016

Reseachers from Laboratory of Physical Chemistry, Eindhoven University of Technology, synthesised bio-based sorbitol-containing polyester polyols via enzymatic polycondensation.

Sustainable coatings from bio-based, enzymatically synthesised polyesters with enhanced functionalities. Source: I-vista/pixelio.de

Sustainable coatings from bio-based, enzymatically synthesised polyesters with enhanced functionalities. Source: I-vista/pixelio.de

The selectivity of the biocatalyst for primary vs. secondary hydroxyl groups allowed for the preparation of close to linear renewable polyester polyols with enhanced hydroxyl functionalities, both as pendant groups and end-groups.

In some cases, the sorbitol units were homogeneously distributed in the polyester polyol chains, whereas changes in the comonomers used and experimental conditions led to inhomogeneous and unique distributions of sorbitol, implying that some polyester polyol chains contained none and others contained multiple sorbitol units.

Improved chemical resistance of the cured network

Solvent-borne coatings were prepared by cross-linking the functional polyester polyols with polyisocyanate curing agents. An increased functionality of the polyester polyols led to an enhancement of the properties of the resulting cured coatings. Furthermore, when sorbitol units were non-homogeneously distributed, a significant improvement in the chemical resistance and mechanical properties of the cured poly(ester urethane) network was noted. By employing the bio-based diisocyanate EELDI (ethyl ester L-lysine diisocyanate) as a curing agent, almost fully renewable coatings with satisfactory mechanical properties were obtained.

The study is published in: Polymer Chemistry, Issue 43, 2016.

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