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

• Type: Article in International Scientific Journal
• Date: 2009

Authors

M. P. Gonçalves (Author) FEUP; J. M. P. Q. Delgado (Author) FEUP; R. O. Nasser (Author) FEUP; M. Vázquez da Silva (Author) FEUP; C. T. Andrade (Author) Other

Journal

Title: Defect and Diffusion Forum

Pages: 565-570

ISSN: 1012-0386

Publisher: Trans Tech Publications Ltd

Indexing

ISI Web of Science

Scopus - 0 Citations

INSPEC

COMPENDEX

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

Other information

Authenticus ID: P-007-PS1

DOI: 10.4028/3-908454-50-6.565

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