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Effects of partial dehydration and freezing temperature on the morphology and water binding capacity of carboxymethyl chitosan-based superabsorbents
Högskolan i Borås, Akademin för textil, teknik och ekonomi.
2010 (Engelska)Ingår i: Industrial and Engineering Chemistry Research, ISSN 0196-4321, Vol. 49, nr 17, s. 8094-8099Artikel i tidskrift (Refereegranskat) Published
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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. 

Ort, förlag, år, upplaga, sidor
2010. Vol. 49, nr 17, s. 8094-8099
Nyckelord [en]
Aqueous solutions, Carboxymethyl chitosan, Dry matters, Freeze drying, Freezing temperatures, Glutaraldehydes, Rotary evaporators, SEM micrographs, Spongelike structure, Super absorbent, Superabsorbent polymer, Superabsorbents, Water binding capacity, Aldehydes, Body fluids, Chitin, Chitosan, Dehydration, Dewatering, Drying, Evaporators, Liquid nitrogen, Military engineering, Solutions, Gels
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Industriell bioteknik
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Identifikatorer
URN: urn:nbn:se:hb:diva-14874DOI: 10.1021/ie100257sISI: 000281107800036Scopus ID: 2-s2.0-77956077591ISBN: 08885885 (ISSN) OAI: oai:DiVA.org:hb-14874DiVA, id: diva2:1236285
Tillgänglig från: 2018-08-01 Skapad: 2018-08-01 Senast uppdaterad: 2018-08-08Bibliografiskt granskad

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Zamani, AkramTaherzadeh, Mohammad J

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