中文摘要：

采用流延成型法制备明胶／聚乙烯醇（Gel／PVA）复合膜，并以乙二醛为交联剂通过溶液交联法制备乙二醛交联的Gel／PVA复合膜，采用红外光谱（FTIR）、X一射线衍射（XRD）、差示扫描量热（DSC）、热重（TG）等表征交联前后复合膜的结构与性能，研究了交联剂用量对Gel／PVA复合膜力学性能及溶解性能的影响。结果表明，随着乙二醛用量的增加，Gel／PVA复合膜的拉伸强度呈先增加后逐渐降低的趋势，而断裂伸长率和溶解率则逐渐降低；乙二醛交联可提高复合膜的熔融温度及热稳定性：乙二醛交联显著影响Gel／PVA复合膜中分子间的氢键和化学结构。

英文摘要：

In this paper, the gelatin/PVA biodegradable composite films were prepared with gelatin （Gel） and poly（vinyl alcohol）（PVA） by a solvent casting method, which were modified by cross-linking with glyoxal. The chemical structure of the GeI/PVA composite films before and after glyoxal cross linking was characterized by Fourier Transform Infrared Spectroscopy（FTIR）, X-ray diffraction（XRD）, differential scanning calorimetr （DSC）, and thermogravimetry analysis（TG）. The effects of crosslinking agent concentration on mechanical properties and solubility the GeI/PVA composite films were investigated. The results show that with increasing the amount of glyxoal, the tensile strength of the GeI/PVA composite films increased and then decreased, while the elongation at break and solubUity of the composite films decreased gradually. The melting temperature and thermal stability of the GeI/PVA composite films were improved by glyoxal crosslinking. The glyxoal crosslinking has an obvious effect on the hydrogen bonding between molecules and chemical structure of GeI/PVA composite films.