Abstract: Chitosan is a kind of natral polymer with antibacterial activity. In this study, chitosan and silicon dioxide composite films was prepated using Sol-Gel method. The microstructure and mechanical properties of the films was examined. The results disclose the existance of strong hydrogen bond between chitosan and silicon dioxide. The crystal structure of chitosan was disordered by introduction of silicon dioxide and there wasgood compatibility between the two component with silicon dioxide content below 7 percent that appear best michanical properties.

Key words: Sol -Gel method; Chitosan; silicon dioxide

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