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Spruce bark‐extracted lignin and tannin‐based bioresin‐adhesives: Effect of curing temperatures on the thermal properties of the resins
University of Borås, Faculty of Textiles, Engineering and Business.
Biochemical Process Engineering, Division of Chemical Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden.
Biochemical Process Engineering, Division of Chemical Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden.
Biochemical Process Engineering, Division of Chemical Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden.
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2021 (English)In: Molecules, ISSN 1431-5157, E-ISSN 1420-3049, Vol. 26, no 12, article id 3523Article in journal (Refereed) Published
Abstract [en]

In this study, formaldehyde‐free bioresin adhesives were synthesised from lignin and tannin, which were obtained from softwood bark. The extraction was done via organosolv treatment and hot water extraction, respectively. A non‐volatile, non‐toxic aldehyde, glyoxal, was used as a substitute for formaldehyde in order to modify the chemical structure of both the lignin and tannin. The glyoxal modification reaction was confirmed by ATR–FTIR spectroscopy. Three different resin formulations were prepared using modified lignin along with the modified tannin. The thermal properties of the modified lignin, tannin, and the bioresins were assessed by DSC and TGA. When the bioresins were cured at a high temperature (200 ℃) by compression moulding, they exhibited higher thermal stability as well as an enhanced degree of cross‐linking compared to the low temperature‐cured bioresins. The thermal properties of the resins were strongly affected by the compositions of the resins as well as the curing temperatures. 

Place, publisher, year, edition, pages
MDPI, 2021. Vol. 26, no 12, article id 3523
Keywords [en]
Bioresin adhesive, Cross‐linking, Curing, Lignin, Thermogravimetric analysis, Wood panel
National Category
Wood Science
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-25915DOI: 10.3390/molecules26123523ISI: 000666465000001PubMedID: 34207740Scopus ID: 2-s2.0-85108356569OAI: oai:DiVA.org:hb-25915DiVA, id: diva2:1579842
Available from: 2021-07-12 Created: 2021-07-12 Last updated: 2023-08-28Bibliographically approved

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Skrifvars, Mikael

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