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Unrefined wood hydrolysates are viable reactants for the reproducible synthesis of highly swellable hydrogels
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.ORCID iD: 0000-0001-5910-1226
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.ORCID iD: 0000-0002-1631-1781
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
2014 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 108, no 1, 281-290 p.Article in journal (Refereed) Published
Abstract [en]

A value-adding robust and sequential synthetic pathway was elaborated to produce hydrogel structures with ionic character from crude acetylated galactoglucomannan-rich wood hydrolysate (WH). The WH was first-step liquor originating from a sulphite cracking pulp process for dissolving pulp. The synthetically modified WH fractions were verified at each step by NMR and FTIR, and the hydrogels were characterized with respect to their swelling and mechanical properties. Altering the crosslinking chemistry and the content of ionic moieties resulted in hydrogels with various swelling ratios and mechanical properties. Renewable hydrogel formulations with swelling ratios as high as Qeq = 270 were achieved.

Place, publisher, year, edition, pages
2014. Vol. 108, no 1, 281-290 p.
Keyword [en]
Biomass, Hemicellulose, Hydrogel, Renewable, Swelling, Wood hydrolysate
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-145380DOI: 10.1016/j.carbpol.2014.02.060ISI: 000336193600036Scopus ID: 2-s2.0-84899464218OAI: oai:DiVA.org:kth-145380DiVA: diva2:718216
Funder
Formas, 2011-1542
Note

QC 20140520

Available from: 2014-05-20 Created: 2014-05-19 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Chemical Pathways to Hemicellulose-rich Biomass Hydrogels
Open this publication in new window or tab >>Chemical Pathways to Hemicellulose-rich Biomass Hydrogels
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. 52 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:12
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-161072 (URN)978-91-7595-452-3 (ISBN)
Presentation
2015-03-13, K2, Teknikringen 28, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20150309

Available from: 2015-03-09 Created: 2015-03-09 Last updated: 2015-03-09Bibliographically approved
2. Synthesis of AcGGM Polysaccharide Hydrogels
Open this publication in new window or tab >>Synthesis of AcGGM Polysaccharide Hydrogels
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Lignocellulosic biomass is believed to serve a prominent role in tomorrow’s sustainable energy and material development. Among the polysaccharide fractions of lignocellulosic biomass, the potential of hemicelluloses as a valuable material resource is increasingly recognized. Thanks to their hydrophilic structure, hemicelluloses are suitable substrates for hydrogel design. The work summarized in this thesis aims to develop feasible strategies for the conversion of O-acetyl galactoglucomannan (AcGGM), an ample hemicellulose in softwood, into hydrogels. Within this framework, four synthetic pathways targeting the formation of crosslinked hydrogel networks from pure or unrefined AcGGM fractions were developed.

 

Aqueous AcGGM-rich and lignin-containing side-stream process liquors of forest industry, known as softwood hydrolysates (SWHs) were formulated into highly swellable hydrogels by: i) allyl-functionalization of AcGGM chains of crude SWH to obtain a viable precursor for hydrogel synthesis via free-radical crosslinking, ii) directly incorporating unmodified SWH fractions into semi-interpenetrating polymer networks (semi-IPNs). SWH hydrogels and semi-IPNs were characterized with appreciable maximum swelling ratios of Qeq = 170 and Qeq = 225, respectively.

 

Rapid crosslinking of AcGGM through thiol-click chemistry was addressed by first imparting thiol functionality onto pure AcGGM chains in a one-pot procedure. The thiolated AcGGM proved to be a suitable substrate for the synthesis of hemicellulose hydrogels via thiol-ene and thiol Michael addition reactions. Finally, sequential full IPNs were developed by subjecting single network hydrogels of pure AcGGM to a second network formation. IPNs obtained through either free radical crosslinking or thiol-ene crosslinking exhibited higher shear storage moduli than their single network counterparts. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 69 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2016:37
Keyword
hemicellulose, O-acetyl-galactoglucomannan, wood hydrolysate, hydrogel, radical polymerization, interpenetrating polymer network, click chemistry, thiol-ene, Michael addition
National Category
Polymer Technologies Polymer Chemistry
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-195091 (URN)978-91-7729-155-8 (ISBN)
Public defence
2016-12-16, Kollegiesalen, Brinellvägen 8, KTH-campus, Stockholm, 10:30 (English)
Opponent
Supervisors
Note

QC 20161102

Available from: 2016-11-02 Created: 2016-11-01 Last updated: 2016-12-16Bibliographically approved

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Maleki, LalehEdlund, Ulrica

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