Water Sorption Isotherms and Textural Properties of Biodegradable Starch-Based Superabsorbent Polymers

Abstract:

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A series of biodegradable superabsorbent polymers (SAP) based on starch grafted with acrylic acid (AA) and crosslinked with N,N’-methylenebisacrylamide (MBIS) were obtained. The parameters that define SAPs properties, such as starch type, amount of initiator, acrylic acid and crosslinker concentrations, and degree of neutralization were varied according to an experimental design. The swelling rate, the degree of swelling, the water sorption isotherms and the texture profile of the new materials were determined. A new method was used to measure the swelling rate. The water sorption results were correlated using various isothermal models as the BET (Brunauer-Emmett-Teller) and GAB (Guggenheim-Andersson-DeBoer) models. Hydrogels obtained from regular cornstarch presented better absorption capacities than those from waxy cornstarch. Maximum swelling was observed for 70% neutralization of carboxylic acid groups. More rigid SAPs presented lower swelling rates, but not necessarily lower swelling degrees.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 283-286)

Edited by:

Andreas Öchsner, Graeme E. Murch and Ali Shokuhfar

Pages:

565-570

DOI:

10.4028/www.scientific.net/DDF.283-286.565

Citation:

J. M.P.Q. Delgado et al., "Water Sorption Isotherms and Textural Properties of Biodegradable Starch-Based Superabsorbent Polymers", Defect and Diffusion Forum, Vols. 283-286, pp. 565-570, 2009

Online since:

March 2009

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$35.00

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