A comparative study of the swelling behaviour of crosslinked chitosan (cr-CS) and its semi-interpenetrating polymer network (IPN) with poly(oxypropylene glycol) (cr-CS/PE semi-IPN) was carried out by DSC, NMR and positron annihilation lifetime spectroscopy (PALS). The results reveal that cr-CS/PE semi-IPN containing hydrophobic moieties has more free volume for water at a definite water content and restricts its mobility less. NMR and PALS data indicate that water clusters coexist with water molecules hydrogen-bonded to the network at the beginning of swelling.
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Yao et al. (1998) studied this question.
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