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Effects of Partial Dehydration and Freezing Temperature on the Morphology and Water Binding Capacity of Carboxymethyl Chitosan-Based Superabsorbents

Akram Zamani (Institutionen för kemi- och bioteknik) ; Mohammad J. Taherzadeh
Industrial and Engineering Chemistry Research (0888-5885). Vol. 49 (2010), 17, p. 8094-8099.
[Artikel, refereegranskad vetenskaplig]

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.

Denna post skapades 2010-09-07. Senast ändrad 2015-07-02.
CPL Pubid: 125754


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Institutionen för kemi- och bioteknik (2005-2014)



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