Synthesis and characterization of semi-interpenetrating networks of chitosan and poly(N-vinyl-2-pyrrolidone)

摘要

A semi-interpenetrating networks (semi-IPNs) based on chitosan and poly(N-vinyl-2-pyrrolidone) were prepared in order to achieve better mechanical properties. The samples were characterized by FTIR, SEM, DMA analysis and the swelling behavior at different pHs (2.0-8.0). The semi-IPNs composition was found to have a great impact the hydrogel structure, mechanical properties, morphology and swelling kinetics. The gels demonstrated substantial change in buffer absorbency with the change of pH, high for acid buffers and lower for pH values above 6 where the swelling was considerably slow. Incorporation of PVP led to better mechanical strength of semi-IPNs keeping satisfactory degree of swelling which make them suitable for various applications.