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Title: Preparation and characterization of hydrogels based on homopolymeric fractions of sodium alginate and PNIPAAm
Authors: Leal, David ×
De Borggraeve, Wim
Encinas, Maria V
Matsuhiro, Betty
Müller, Robert #
Issue Date: Jan-2013
Publisher: Applied Science Publishers
Series Title: Carbohydrate Polymers vol:92 issue:1 pages:157-166
Abstract: Graft copolymers were prepared by formation of an amide bond between poly-α-l-guluronic acid (MW 24,000), isolated from sodium alginate and the free amino group of PNIPAAm-NH(2). SEM micrographs revealed the formation of a macroscopic network on the surface of the grafted hydrogels with a porosity diameter of 10-20μm. Semi-IPN hydrogels were prepared using different proportions of sodium poly-β-d-mannuronate (MW 21,000), isolated from sodium alginate and cross-linked PNIPAAm-NH(2) polymers. SEM micrographs showed porosities of minor size (∼5μm). Though both types of hydrogels are good water containers, the water retention capacity of graft copolymers is more than 50% higher than that of semi-IPN hydrogels. Both hydrogel types showed significant changes in swelling ratios between 20 and 45°C: the swelling ratio decreases near the LCST of PNIPAAm. The water absorption and retention capacity of graft hydrogels increases with pH, reaching a maximum value at pH 7.0.
ISSN: 0144-8617
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Design and Synthesis
× corresponding author
# (joint) last author

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