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Green Semi-IPN Hydrogels by Direct Utilization of Crude Wood Hydrolysates
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-5910-1226
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-1631-1781
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
2016 (English)In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, ISSN 2168-0485, Vol. 4, no 8, 4370-4377 p.Article in journal (Refereed) Published
Abstract [en]

Crude and unmodified acetylated galactoglucomannan containing wood hydrolysate (WH) was directly incorporated into a semi-interpenetrating network (semi-IPN) composed of up to 60% renewable polymers. Semi-IPNs were produced by a facile and green synthetic pathway through cross-linking modified carboxymethylcellulose in the presence of at least 30%(w/w) WH, via free radical copolymerization with acrylic acid and N,N'-methylenebis(acrylamide). FTIR verified the presence of WH interlaced with CMC in the semi-IPN, and the highly porous microscopic structure of the networks was confirmed by SEM. The gelation process of these networks was monitored in situ, and their individual "gel point" (the G'-G '' crossover) was determined by in situ rheological measurements. Semi-IPN hydrogels ratios (Q = 20-225) were obtained within 2.8-20 min of a cross-linking reaction.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2016. Vol. 4, no 8, 4370-4377 p.
Keyword [en]
Interpenetrating network, Hemicellulose, Biomass, Wood hydrolysate, Hydrogel
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-192739DOI: 10.1021/acssuschemeng.6b00938ISI: 000380869800036Scopus ID: 2-s2.0-84979974282OAI: oai:DiVA.org:kth-192739DiVA: diva2:974458
Note

QC 20160926

Available from: 2016-09-26 Created: 2016-09-20 Last updated: 2016-11-01Bibliographically approved
In thesis
1. 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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