摘要：

Semi-interpenetrating polymer network (semi-IPN) hydrogels composed of <img src="/content/P7264185L84H1543/xxlarge946.gif" alt="beta" align="MIDDLE" border="0">-chitosan and poly(ethylene glycol) diacrylate macromer (PEGM) were synthesized and characterized for the application as potential biomedical materials. The mixture of PEGM and <img src="/content/P7264185L84H1543/xxlarge946.gif" alt="beta" align="MIDDLE" border="0">-chitosan, dissolved in water including a small amount of acetic acid, was cast to prepare hydrogel films, followed by a subsequent crosslinking with 2,2-dimethoxy-2-phenylacetophenone as a non-toxic photoinitiator by ultraviolet irradiation. Photocrosslinked hydrogels exhibited relatively high equilibrium water content in the range 77–83% which is mainly attributed to the free water content rather than to the bound water, hydrogen bonded with components in semi-IPN hydrogels. The crystallinity, thermal properties and mechanical properties of semi-IPN hydrogels were s

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