Journal article
Bio-Based Epoxy Binders from Lignin Derivatized with Epoxidized Rapeseed Fatty Acids in Bimodal Coating Systems
Department of Chemical and Biochemical Engineering, Technical University of Denmark1
The Hempel Foundation Coatings Science and Technology Centre (CoaST), Department of Chemical and Biochemical Engineering, Technical University of Denmark2
The Danish Polymer Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark3
PROSYS - Process and Systems Engineering Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark4
KT Consortium, Department of Chemical and Biochemical Engineering, Technical University of Denmark5
CHEC Research Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark6
In the recent decade, a strong push toward development of more biobased binders for coating applications as part of the transition toward independence from nonrenewable fossil-based raw materials has been seen. Here we present a biobased epoxy lignin/rapeseed fatty acid derivative (eFA-L), which has been applied in coating systems, leading to coatings with >97% biobased content and Y = 130 MPa.
To approach the strength of classical epoxy systems, a series of bimodal systems, containing low molecular weight adducts of biobased diglycidyl furan-2,5-dicarboxylate (DGFDC) and fossil-based diglycidylether bisphenol A (DGEBA) were prepared. In these bimodal systems, it was shown that DGEBA contributes to higher mechanical strength compared to DGFDC at equivalent cross-linking density, which was attributed to increased π–π stacking interactions.
The biobased bimodal binder system composed of eFA-L and DGFDC (30 wt %) resulted in a coating with a biobased content of 93 wt %, Y = 440 MPa, and Tg > 50 °C. Better mechanical properties (Y = 700 MPa) were achieved by use of DGEBA (30 wt %), but it results in a significant reduction in biobased content to 62 wt %.
Language: | English |
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Publisher: | American Chemical Society |
Year: | 2022 |
Pages: | 444-451 |
ISSN: | 26376105 |
Types: | Journal article |
DOI: | 10.1021/acsapm.1c01351 |
ORCIDs: | Silau, Harald , Woodley, John M. , Dam-Johansen, Kim and Daugaard, Anders E. |
5-dicarboxylate biobased diglycidylfuran-2 epoxy lignin thermoset