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Chemical Pathways to Hemicellulose-rich Biomass Hydrogels
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.ORCID iD: 0000-0001-5910-1226
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: urn:nbn:se:kth:diva-161072ISBN: 978-91-7595-452-3 (print)OAI: oai:DiVA.org:kth-161072DiVA: diva2:793620
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
List of papers
1. Unrefined wood hydrolysates are viable reactants for the reproducible synthesis of highly swellable hydrogels
Open this publication in new window or tab >>Unrefined wood hydrolysates are viable reactants for the reproducible synthesis of highly swellable hydrogels
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.

Keyword
Biomass, Hemicellulose, Hydrogel, Renewable, Swelling, Wood hydrolysate
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-145380 (URN)10.1016/j.carbpol.2014.02.060 (DOI)000336193600036 ()2-s2.0-84899464218 (Scopus ID)
Funder
Formas, 2011-1542
Note

QC 20140520

Available from: 2014-05-20 Created: 2014-05-19 Last updated: 2017-12-05Bibliographically approved
2. Thiolated hemicellulose as a versatile platform for one-pot click-type hydrogel synthesis
Open this publication in new window or tab >>Thiolated hemicellulose as a versatile platform for one-pot click-type hydrogel synthesis
2015 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 16, no 2, 667-674 p.Article in journal (Refereed) Published
Abstract [en]

A one-pot synthetic methodology for the thiolation of O-acetyl-galactoglucomannan (AcGGM) was developed to merge hemicellulose chemistry with "click" chemistry. This was realized by the AcGGM-mediated nucleophilic ring-opening of γ-thiobutyrolactone via the activation of the polysaccharide pendant hydroxyl groups. The incorporation of thiol functionalities onto the hemicellulose backbone was visualized by 1H and 13C NMR spectroscopy and was assessed by an Ellman's reagent assay of the thiol groups. The versatility of the thiolated AcGGM was elaborated and demonstrated by conducting several postmodification reactions together with hydrogel formation utilizing thiol-ene and thiol-Michael addition "click" reactions. The one-pot synthesis of thiolated AcGGM is a straightforward approach that can expand the applications of hemicelluloses derived from biomass by employing "click" chemistry.

Keyword
Addition reactions, Hydrogels, Nuclear magnetic resonance spectroscopy, Galactoglucomannan, Hydrogel formation, Hydroxyl groups, Michael additions, Nucleophilic ring opening, One-pot synthesis, Post-modification, Synthetic methodology
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-161070 (URN)10.1021/bm5018468 (DOI)000349273000026 ()2-s2.0-84922511118 (Scopus ID)
Note

QC 20150309

Available from: 2015-03-09 Created: 2015-03-09 Last updated: 2017-12-04Bibliographically approved

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Maleki, Laleh

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