Hydrogels of cellulose acetate crosslinked with pyromellitic dianhydride: part I: synthesis and swelling kinetics

This work describes the synthesis of hydrogels of cellulose acetate (AC) crosslinked with 1,2,4,5-benzenotetracarboxylic dianhydride (PMDA). The crosslinking reaction was monitored by FTIR. Analysis of aromatic fragments from the alkaline hydrolysis of the gels by UV spectroscopy indicated that an i...

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Bibliographic Details
Published in:Química Nova 2013, Vol.36 (1), p.102-106
Main Authors: Oliveira, Víctor A., Veloso, Tácia C., Leão, Versiane A., Santos, Cláudio G. dos, Botaro, Vagner R.
Format: Article
Language:English
Subjects:
cellulose acetate
CHEMISTRY, MULTIDISCIPLINARY
hydrogel
PMDA
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Summary:This work describes the synthesis of hydrogels of cellulose acetate (AC) crosslinked with 1,2,4,5-benzenotetracarboxylic dianhydride (PMDA). The crosslinking reaction was monitored by FTIR. Analysis of aromatic fragments from the alkaline hydrolysis of the gels by UV spectroscopy indicated that an increase in the stoichiometric ratio of dianhydride resulted in higher degrees of crosslinking. The non-porous nature of the gels was confirmed by analysis of nitrogen adsorption. Water absorption isotherms showed that as the temperature and degree of crosslinking increased, the percentage of water absorbed at equilibrium (%Seq) also increased. The hydrogels presented second order swelling kinetics.
ISSN:0100-4042
1678-7064
DOI:10.1590/S0100-40422013000100019