中国海洋大学学报（自然科学版）2011，Vol.41Issue(10)：61-66,6.
离子交联壳聚糖/海藻酸钠可降解复合膜的研究
Ionic Cross-Linking Chitosan/Alginate Biodegradable Composite Film
摘要
Abstract
A biodegradable composite film was made from chitosan and alginate, cross-linked by 10% so dium citrate and 3% calcium chloride solution. Effects of cross-linking time and pH on the mechanical properties and water resistance of the composite film were investigated. Besides, X-ray diffraction (XRD) and differential seanning calorinetry (DSC) were applied to characterize and analyze the thermal stability of the film. The results showed that the thickness of the composite film (24. 2 μm) was less than the sum of thickness of chitosan film and alginate film (39 μm). This result indicated that chitosan and alginate partially mixed at the interface and might interact with each other during the film preparation. XRD and DSC showed that sodium citrate and calcium chloride cross-linked chitosan and alginate respectively, and the cross-linking decreased crystalline and improved thermal stability of the composite film. The best properties of the composite film could be achieved under a cross-linking time of 30 min and pH 7. 0, with the highest tensile strength (120 Mpa), while lowest water solubility (only 8. 25%). The composite film overcame the drawbacks of single chitosan and alginate film, such as low mechanical properties and poor water resistance. The composite film was expected to replace low-density polyethylene, as a new food preservation packaging film.关键词
壳聚糖/海藻酸钠/离子交联/可降解复合膜Key words
chitosan/Alginate/ionic cross-linking/biodegradable composite film分类
化学化工引用本文复制引用
高美玲,汪东风,杨伟,徐莹,张莉..离子交联壳聚糖/海藻酸钠可降解复合膜的研究[J].中国海洋大学学报（自然科学版）,2011,41(10):61-66,6.基金项目
国家自然科学基金项目(30972289) （30972289）
国家海洋公益性项目(201005020)资助 （201005020）
