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Water sorption isotherms and textural properties of bio-degradable starch-based super-absorbent polymers

Title
Water sorption isotherms and textural properties of bio-degradable starch-based super-absorbent polymers
Type
Article in International Scientific Journal
Year
2009
Authors
M. P. Gonçalves
(Author)
FEUP
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J. M. P. Q. Delgado
(Author)
FEUP
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R. O. Nasser
(Author)
FEUP
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M. Vázquez da Silva
(Author)
FEUP
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C. T. Andrade
(Author)
Other
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Publicação em ISI Web of Science ISI Web of Science
Publicação em Scopus Scopus - 0 Citations
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Scientific classification
FOS: Engineering and technology > Other engineering and technologies
Other information
Authenticus ID: P-007-PS1
Resumo (PT):
Abstract (EN): 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.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 6
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