壳聚糖-PE双层抑菌保鲜膜的结构和热稳定性

Structure and thermal stability of chitosan-PE bi-layer film

采用流延法将壳聚糖成膜液涂覆在PE保鲜膜的表面制备壳聚糖-PE双层抑菌保鲜膜。分析壳聚糖-PE双层膜的结构和热稳定性,以期观测双层膜中有无新的化学键形成以及壳聚糖膜是否与PE膜形成一定的界面结合,通过红外光谱和扫描电子显微镜分析双层膜的结构,采用热重分析法和示差扫描量热法分析双层膜的热稳定性。结果表明,壳聚糖涂膜层与PE膜结合时未形成新的化学键,PE膜结构也未受到壳聚糖涂膜的影响,壳聚糖膜与PE膜之间形成了良好的界面结合。

In this work chitosan-PE bi-layer films were prepared by casting method. The structure and thermal stability were analyzed to observe the existence of new chemical bonds and adhesiveness between chitosan-PE films. The films structure and thermal stability were observed by infrared spectroscopy coupled with scanning electron microscope and thermogravimetric analysis coupled with differential scanning calorimetry, respectively. The results showed that no new chemical bonds were formed between chitosan and PE film surface, and the structure of PE film was not influenced by chitosan coating. However, the adhesiveness of films between chitosan and PE film was fine.