Abstract
The state and mobility of water in crosslinked chitosan–polyether semi interpenetrating network (IPN) (cr-CS–PE semi-IPN) was studied using differential scanning calorimetry (DSC) and nuclear magnetic resonance (NMR), respectively. The effect of water content on free volume for water in gel network was investigated by positron annihilation lifetime spectroscopy (PALS) and its effect on the diffusion coefficient are discussed as well. The results show that with the increase of water content, the mobility of water molecules and the free volume of hydrogel network are enhanced. In the following free-volume diffusion equation: D = Aexp(−B/Vf), A and B are not constant but are considered as the functions of water contents. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 449–453, 1999
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