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Softwood-based sponge gels
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2016 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 23, no 5, p. 3221-3238Article in journal (Refereed) Published
Abstract [en]

Crosslinking-aided gelation was utilized to prepare hydrogels from softwood polysaccharides, with spruce galactoglucomannans (GGM)—a group of largely unexploited hemicelluloses—as the main component, aiming at conversion into sponge-like aerogels. Cellulose nanofibrils were used for the formation of a reinforcing network, which was further crosslinked together with a GGM matrix by ammonium zirconium carbonate, an inorganic salt that is regarded as safe for use in food packaging. The hydrogels were freeze-dried into stiff, low-density aerogels with 98 % of their volume composed of air-filled pores. When immersed in water, the aerogels absorbed water up to 37 times their initial weight, demonstrating elasticity and repeatable and reversible sponge capacity. The developed concept reassembles the wood polysaccharides in a new way, creating interesting possibilities for utilizing the abundant “green gold,” GGM. The obtained biobased materials could find application potential, for example, in the field of food packaging and could contribute in the reduction of the usage of petroleum-based plastics in the future.

Place, publisher, year, edition, pages
2016. Vol. 23, no 5, p. 3221-3238
Keywords [en]
Aerogels; Cellulose; Crosslinking; Gelation; Packaging machines; Packaging materials; Polysaccharides; Softwoods, Air-filled pores; Bio-based materials; Cellulose nanofibrils; Chemical cross-linking; Food packaging; Galactoglucomannan; Initial weights; Inorganic salts, Hydrogels
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Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12620DOI: 10.1007/s10570-016-1010-2Scopus ID: 2-s2.0-84978873807OAI: oai:DiVA.org:ri-12620DiVA, id: diva2:971104
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Available from: 2016-09-15 Created: 2016-09-15 Last updated: 2017-11-21Bibliographically approved

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