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Effects of partial dehydration and freezing temperature on water binding capacity of chitosan-based superabsorbents
University of Borås, School of Engineering.
University of Borås, School of Engineering.ORCID iD: 0000-0003-4887-2433
2010 (English)In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 49, no 17, 8094-8099 p.Article in journal (Refereed) Published
Abstract [en]

Superabsorbent polymers (SAPs) were prepared from carboxymethyl chitosan (CMCS) cross-linked to a gel, concentrated by partial dehydration in a rotary evaporator (at 70, 85, and 100 °C), frozen at −5, −20, and −196 °C, and then freeze dried. A 0.9% aqueous solution of CMCS was gelled by addition of glutaraldehyde and partially dehydrated to 1.3−16.8% dry matter (DM) before freeze drying. The water binding capacity (WBC) of the products was up to 171 g/g of superabsorbent. The best results were obtained when 32−81% of the water in the gel was removed in the evaporator at 85−100 °C, and the concentrated gel (1.3−4.7% DM) was frozen in liquid nitrogen at −196 °C before freeze drying. On average, these SAPs, according to SEM micrographs, had a porous sponge-like structure and absorbed 35 and 32 g/g of saline and urine solutions after 10 min exposure, respectively. The corresponding WBC of two commercial polyacrylate-based SAPs was 34−57 g/g for saline and 30−37 g/g for urine solutions.

Place, publisher, year, edition, pages
American Chemical Society , 2010. Vol. 49, no 17, 8094-8099 p.
Keyword [sv]
Energi och material
National Category
Industrial Biotechnology
Identifiers
URN: urn:nbn:se:hb:diva-2867DOI: 10.1021/ie100257sLocal ID: 2320/6992OAI: oai:DiVA.org:hb-2867DiVA: diva2:870961
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2016-09-29Bibliographically approved

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Zamani, AkramTaherzadeh, Mohammad
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