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Microwave-assisted fractionation and functionalization of technical lignin toward thermoset resins
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Coating Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-1184-1310
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Coating Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-8127-9183
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymer Technology.ORCID iD: 0000-0002-6313-8539
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymer Technology.ORCID iD: 0000-0002-7790-8987
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2023 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 140, no 45, article id e54645Article in journal (Refereed) Published
Abstract [en]

Lignin is the most abundant aromatic biopolymer, with a potential to serve as a building block of rigid and thermally stable bio-based materials. However, it is still underutilized because of the heterogeneous and not fully understood chemical structure. Here, technical softwood Kraft lignin is refined in to narrow-dispersity and relatively low molar mass fractions by microwave-assisted processing, followed by microwave-assisted allylation and further application in lignin-based thermosets. This microwave processing is carried out under non-catalyzed conditions using a low boiling point solvent and elevated pressure. The properties of the retrieved fractions are investigated by 31P-NMR, heteronuclear single quantum coherence spectroscopy-NMR, SEC, differential scanning calorimetry, and thermogravimetric analysis. The extraction yield of the selected lignin fraction is around 25%, with the number-average molar mass (Mn), weight-average molar mass (Mw), and dispersity (Đ) significantly reduced. The chemically modified lignin is characterized by 31P NMR and FTIR, which provides evidence of the introduction of the allyl moieties. The analyses demonstrate that 90 ± 3% of the hydroxyl groups in fractionated lignin are successfully allylated. Subsequently, the allylated lignin is cross-linked through thermally induced thiol-ene chemistry to produce lignin-based thermosets. The final thermosets exhibit a storage modulus of 4050 ± 60 MPa and a Tg of 105 ± 5°C.

Place, publisher, year, edition, pages
Wiley , 2023. Vol. 140, no 45, article id e54645
Keywords [en]
allylation, microwave-assisted fractionation, microwave-assisted functionalization, softwood lignin, thiol-ene thermosets
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-347512DOI: 10.1002/app.54645ISI: 001060855200001Scopus ID: 2-s2.0-85169677590OAI: oai:DiVA.org:kth-347512DiVA, id: diva2:1871466
Note

QC 20240617

Available from: 2024-06-17 Created: 2024-06-17 Last updated: 2024-06-17Bibliographically approved

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Truncali, AlessioRibca, IulianaYao, Jenevieve G.Hakkarainen, MinnaJohansson, Mats

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Truncali, AlessioRibca, IulianaYao, Jenevieve G.Hakkarainen, MinnaJohansson, Mats
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Coating TechnologyWallenberg Wood Science CenterPolymer Technology
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