Synthesis and characterization of sodium alginate/acrylamide semi-interpenetrating polymer networks

摘要

Sodium alginate (NaAlg)/acrylamide (AAm) semi-interpenetrating polymer networks (IPNs) were prepared with three different compositions, in which the NaAlg concentration was 1, 2, or 3% (w/v) in 50% (w/v) AAm solutions. These solutions were irradiated with a Co-60 gamma source at different doses. The conversion percentage was determined as follows. The NaAlg/AAm IPN hydrogels were immersed to swell in a solution of the desired pH (3-9) at 25 degrees C. The swelling results at pHs 7.0 and 9.0 indicated that the NaAlg/AAm IPN hydrogel containing 3% NaAlg showed the maximum swelling percentage in water. The diffusion of water within the NaAlg/AAm IPN hydrogels was non-Fickian in character. The diffusion coefficients of the NaAlg/AAm IPN hydrogels in water were calculated. The thermal properties of NaAlg, polyacrylamide, and NaAlg/AAm IPNs were determined. (c) 2006 Wiley Periodicals, Inc.