Abstract:

Hydrophylichydrophobic polyvinylpyrrolidone（PVP）semiIPNpolycaprolactone（PCL）hydrogels were prepared through free radical polymerization of N-vinyl pyrrolidone（NVP）in ethyl acetateThe melting temperature T_m kept unchanged and that was resulted from the formation of PVP-semi-IPN-PCLThe influences of some factors，such as PVP content，initiator and crosslinking agent on the swelling properties of hydrogels were investigatedIt was found that the equilibrium swelling ratio（ESR）of hydrogels increased and the bond water content in hydrogels increased with increasing PVP contentBecause of cage effect，the ESR of hydrogel with azodiisobutyronitrile（AIBN）as initiator was lower than that initiated by benzoyl peroxide（BPO）at a low initiator concentrationAs compared with NMBA crosslinking agent，hydrogels with glutaric dialdehyde（GDA）as crosslinking agent had a higher ESR at a lower concentration while had a lower ESR at a higher concentrationThe swelling kinetics of hydrogels were discussed with the Fick model and n value calculated were 0.854，0.471，0.466，0.253 with PVP content (mass)20%，40%，60%，80%, respectivelyIt could be concluded that the swelling properties of hydrogels fit the Fick model well at a proper PVP content.