RADIATION INDUCED ACRYLAMIDE/CITRIC ACID HYDROGELS AND THEIR SWELLING BEHAVIORS

31 October 2001

journal article
Published by Taylor & Francis in Journal of Macromolecular Science, Part A

Vol. 38 (11) , 1105-1121
https://doi.org/10.1081/ma-100107132

Abstract

Citric acid (CAc) moieties containing acrylamide (AAm) hydrogels were prepared by gamma irradiation of their aqueous solutions. A possible polymerization and crosslinking mechanism for acrylamide/citric acid (AAm/CAc) hydrogels is proposed. The effects of irradiation dose and citric acid content on swelling behavior were investigated. Swelling took place in water at 25°C and was followed gravimetrically. Incorporation of a relatively low amount of citric acid to acrylamide hydrogel increased its swelling up to 950% from 700%. The diffusion of water into AAm/CAc hydrogels was found to be a non-Fickian type. Diffusion coefficients of AAm/CAc hydrogels found as 5 × 10−7− 10 × 10−7 cm2 sec−1. It has also been found that the number average molar mass between crosslinks is increased with the CAc content and decreased with irradiation dose.

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