| 摘要 |
PURPOSE: A biodegradable copolymer of γ-polyglutamic acid and chitosan and a film prepared by using the copolymer are provided, to improve biodegradability, tensile strength and elongation and to reduce the solubility to water. CONSTITUTION: The biodegradable copolymer is a copolymer of γ-polyglutamic acid and chitosan, wherein the copolymer is preferably represented by the formula 1. The degree of deacetylation of the chitosan is 80-100 %, and the viscosity of the chitosan is 100-150 cps. Preferably the γ-polyglutamic acid and chitosan is separated from Bacillus licheniformis. The film prepared by using the copolymer has a tensile strength of 50-100 MPa, an elongation of 10-20 %, a solubility to water of 1.0-10.0 %, and a moisture absorption ratio of 1.0-20.0 %.
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