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A new foaming technique for production of superabsorbents from carboxymethyl chitosan
University of Borås, School of Engineering.
University of Borås, School of Engineering.ORCID iD: 0000-0003-4887-2433
2010 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 80, no 4, 1091-1101 p.Article in journal (Refereed) Published
Abstract [en]

A foaming technique was developed for production of superabsorbent polymers (SAP) from carboxymethyl chitosan (CMCS) with high, medium and low molecular weights. In this method n-pentane was used as a blowing agent due to low boiling point and immiscibility with water. n-Pentane was added to a warm aqueous solution of CMCS and boiled. CMCS was then gelled by adding the crosslinking agent glutaraldehyde and consequently n-pentane was captured inside the polymer network. The n-pentane was evaporated from this network while drying in oven. It resulted in stable foam that prevented the hydrogel from collapsing and the dried product had a porous structure with a high water-binding capacity (WBC). The effects of molecular weight of CMCS and its concentration, and the amounts of glutaraldehyde and n-pentane used, on WBC were investigated and optimized using response surface experimental design. The best result for WBC of foam-dried SAP was 107 (g/g) after exposing for 1 h in pure water and 60 (g/g) and 37 (g/g) after exposing for one min in pure water and 0.9% NaCl solution, respectively. The WBC of the SAP produced by the foaming technique was more than five times higher than the WBC of the oven-dried crosslinked CMCS.

Place, publisher, year, edition, pages
Pergamon , 2010. Vol. 80, no 4, 1091-1101 p.
Keyword [sv]
Energi och material
National Category
Industrial Biotechnology
Identifiers
URN: urn:nbn:se:hb:diva-2871DOI: 10.1016/j.carbpol.2010.01.029Local ID: 2320/7000OAI: oai:DiVA.org:hb-2871DiVA: diva2:870965
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2016-09-29Bibliographically approved

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CiteExportLink to record
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