聚乙二醇改性毕业论文

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1、 I 本科毕业论文本科毕业论文 聚乙二醇改性壳聚糖膜的制备及应用聚乙二醇改性壳聚糖膜的制备及应用 PREPARATION AND APPLICATION OF POLYETHYLENE GLYCOL MODIFIED CHITOSAN FILMS 学院（部） ： 材料科学与工程学院 专业班级： 高分子材料与工程 2007 级 1 班 II 聚乙二醇改性壳聚糖膜的制备及应用 摘要 本文利用挥发溶剂的方法合成壳聚糖-聚乙二醇共混膜，用自制过滤装置和分光光 度计去对共混膜的透过率和透光性性能进行了检测,还就膜的水溶性和溶胀性进行研究。 结果表明，单纯壳聚糖膜的亲水性比较差，而且壳聚糖膜性脆。与纯壳聚

2、糖膜相比，聚 乙二醇加入壳聚糖物理共混制得的膜，亲水性、水溶性以及透水性等性能有很好改善。 虽然共混膜的这些性能与 PEG 量有很大关系， 但是并不是 PEG 量加的越多越好。 当 PEG 在共混膜所占比例超过 30%，将不利于成膜，或者成膜效果很差。 关键词：壳聚糖、聚乙二醇、亲水性、水溶性、透水性 III PREPARATION AND APPLICATION OF POLYETHYLENE GLYCOL MODIFIED CHITOSAN FILMS ABSTRACT In this study, chitosan- polyethylene glycol membrane was pr

3、epared by the method of volatilizing solvent. The performances of blend membranes were detected through photometer, colation equipment by home-made and method of water absorption. In result, pure chitosan membrane had a bad hydrophily and a bad limpness. When polyethylene glycol was mixed in chitosa

4、n, hydrophily water-solubility and water permeability of membranes can be improved. And, though chitosan-polyethylene glycol membranes transmittancy, hydrophily and water-solubility has a great connection with the quantity of polyethylene glycol, more quantities of polyethylene glycol did not always come with improvement of these performances. When the ratio of PEG exceeded 30% in blending film, it is difficulty of preparing films, and prepared films had a bad performance. KEYWORDS: chi