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A new foaming technique for production of superabsorbents from carboxymethyl chitosan
Högskolan i Borås, Institutionen Ingenjörshögskolan.
Högskolan i Borås, Institutionen Ingenjörshögskolan.ORCID-id: 0000-0003-4887-2433
2010 (Engelska)Ingår i: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 80, nr 4, s. 1091-1101Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Pergamon , 2010. Vol. 80, nr 4, s. 1091-1101
Nyckelord [sv]
Energi och material
Nationell ämneskategori
Industriell bioteknik
Identifikatorer
URN: urn:nbn:se:hb:diva-2871DOI: 10.1016/j.carbpol.2010.01.029Lokalt ID: 2320/7000OAI: oai:DiVA.org:hb-2871DiVA, id: diva2:870965
Tillgänglig från: 2015-11-13 Skapad: 2015-11-13 Senast uppdaterad: 2017-12-01Bibliografiskt granskad

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Zamani, AkramTaherzadeh, Mohammad

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