使用浇注成型的方式将壳聚糖与明胶共混改性制膜，测定复合膜的力学性能和吸水率，从而确定制备复合膜的最佳工艺条件和最佳配比。扫描电子显微镜观察结果显示，当明胶质量分数为30%时，壳聚糖和明胶分子之间的相互作用会使壳聚糖分子形成纤维状规整的排列，复合膜的力学性能相比纯壳聚糖膜显著提高。随后选用甘油作为增塑剂，发现甘油质量分数为8%时复合膜的增塑效果最好。然后继续将聚乙烯醇和交联剂硼酸、柠檬酸等引入复合体系，发现增塑剂和交联剂的加入能够有效改善复合膜的力学性能，硼酸和柠檬酸均对体系有一定程度的交联作用。柠檬酸交联复合膜的抗张强度和断裂伸长率较高，吸水率较低。

Chitosan and gelatin were blended and modified to form films using a casting method. The mechanical properties and water absorption rate of the composite films were measured to determine the optimal process conditions and the best ratio for preparing the composite films. Scanning electron microscopy observations revealed that when the mass fraction of gelatin was 30%, the interaction between chitosan and gelatin molecules caused the chitosan molecules to form a fibrous and orderly arrangement. As a result, the mechanical properties of the composite film were significantly improved compared to those of pure chitosan films. Subsequently, glycerol was selected as a plasticizer, and it was found that a mass fraction of 8% glycerol provided the best plasticizing effect on the composite film. Polyvinyl alcohol and crosslinking agents such as boric acid and citric acid were then introduced into the composite system. It was discovered that the addition of plasticizers and crosslinking agents effectively enhanced the mechanical properties of the composite film, with both boric acid and citric acid contributing to the crosslinking of the system. The composite film crosslinked with citric acid exhibited higher tensile strength and elongation at break, as well as a lower water absorption rate.