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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

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

Revista

Título: Defect and Diffusion Forum

Páginas: 565-570

ISSN: 1012-0386

Editora: Trans Tech Publications Ltd

Indexação

ISI Web of Science

Scopus - 0 Citações

INSPEC

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Outras ciências da engenharia e tecnologias

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6