Abstract
Polyacrylamide grafted poly(vinyl alcohol)/polyvinylpyrrolidone (PAM-g-PVA/PVP) semi-interpenetrating polymer network (semi-IPN) hydrogels were designed and prepared via a simple free radical polymerization route initiated by a PVA-(NH4)2Ce(NO3)6 redox reaction technique. The structure of the PAM-g-PVA/PVP hydrogels was characterized by a Fourier transform infrared spectroscope (FTIR), and the morphologies were observed by a scanning electron microscopy (SEM). The swelling kinetics investigations demonstrated that the equilibrium swelling (Q e ) of the (PAM-g-PVA/PVP) semi-IPN hydrogels depended on PVP compositional ratios and temperature. The Q e values were reduced with increasing the PVP contents, which was in agreement with theoretical water contents (S ∞) fitted by swelling kinetic data, and the swelling mechanism belonged to a non-Fickian mode for the PAM-g-PVA/PVP hydrogels. These hydrogels displayed thermosensitivities different from the common thermoresponsive gels that have a lower critical solution temperature. The swelling is enhanced with increasing the temperature of the media before 42°C, and later the equilibrium swelling is contrarily reduced. Therefore, the swelling behavior of the PAM-g-PVA/PVP hydrogels may be controlled and modulated by means of the compositional ratios of PVP to PAM-g-PVA and temperature.
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Wei, QB., Luo, YL., Gao, LJ. et al. Synthesis, characterization and swelling kinetics of thermoresponsive PAM-g-PVA/PVP semi-IPN hydrogels. Polym. Sci. Ser. A 53, 707–714 (2011). https://doi.org/10.1134/S0965545X11080062
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DOI: https://doi.org/10.1134/S0965545X11080062