本文采用酯化淀粉以三乙酸甘油酯为增塑剂，经流延法制备了酯化淀粉薄膜，并利用傅里叶红外光谱衰减全反射技术（ATR-FTIR）和热重分析仪（TGA）分析了淀粉基膜材与不同食品模拟体系接触后其表层增塑剂和整体增塑剂的变化情况。结果表明，基于与淀粉基膜材、增塑剂之间的亲和性差异，食品模拟体系对淀粉基膜材产生不同的溶胀作用，导致不同程度的增塑剂迁移；与淀粉基膜材亲和性越高的食品模拟体系，对淀粉基膜材表层和内部的溶胀更迅速，并可溶解更多的增塑剂分子，从而导致淀粉基膜材中更大程度的增塑剂迁移；表层增塑剂和整体增塑剂的迁移情况差异表明，溶剂溶胀和增塑剂迁移由膜材表层向内部发生。基于以上结果可推断，在实际应用过程中，选择合适的应用领域、设计调整材料结构可主动抑制增塑剂迁移，实现这类新型包装材料的安全使用。

Starch ester films were prepared using solvent-casting method, with triacetin as a plasticizer. Changes in surface plasticizer content and total plasticizer content after immersion of the films in different food simulants were analyzed by performing attenuated total reflectance-Fourier transform infrared spectroscopy and thermogravimetric analysis. Different swelling effects on the starch-based films were found by using the food simulant system due to different affinities between the food simulants and materials used for preparing the starch-based film materials and the plasticizer resulting in different degrees of plasticizer migration. Food simulants with higher affinity toward the materials used for preparing the starch-based films exerted a rapid swelling effect on the external and internal regions of the films and resulted in higher dissolution of the plasticizer, thus increasing its migration. The difference in the migration of surface plasticizer and overall plasticizer suggested that the swelling effect of the solvents occurred from the external the film to the internal the film, and the plasticizer also migrated from the external film to the internal film. These results suggested that safe application of this novel starch-based packaging material could be achieved by modifying its structure to actively inhibit the migration of plasticizers.

国家自然科学基金资助项目（31401586,21376095）