通过选择不同直链淀粉/支链淀粉比例的酯化淀粉，制备了不同结构特征的淀粉基薄膜，并对这些结构对抑制增塑剂邻苯二甲酸二乙酯（DEP）在微波条件下迁移的影响进行了研究。结果表明，直链淀粉/支链淀粉比例为零的waxy酯化淀粉薄膜材料中分子间相互作用力强，有序微区尺寸较大，抑制DEP迁移的程度最大。直链淀粉/支链淀粉比例为50%的G50酯化淀粉薄膜材料中，分子间相互作用力虽弱，但较大的有序微区及内部致密的结构起到了较好地限制增塑剂迁移的作用。直链淀粉/支链淀粉比例为80%的G80酯化淀粉薄膜材料中虽微晶存在，但分子间相互作用力较弱、有序微区尺寸小、增塑剂迁移量最大。因此，可以通过改变直链淀粉与支链淀粉的比例来降低酯化淀粉薄膜中增塑剂的迁移，为更好地合理设计及安全使用淀粉基薄膜材料提供了基础数据及理论依据。

Hydrophobic esterified starch-based films with different structures were prepared by using esterified starches with different ratios of amylose and amylopectin, and the inhibitory effect of these structures on migration of the plasticizer diethyl phthalate (DEP) during microwave treatment was investigated. The results indicated that the waxy esterified starch-based film (waxy ES) with an amylose and amylopectin ratio of zero exhibited a strong molecular interaction, a large ordered aggregation region, and the strongest inhibitory effect on DEP migration. For the esterified starch-based film (G50 ES) with an amylose and amylopectin ratio of 50%, despite weak molecular interaction, the large ordered aggregation region and the compact internal structure impeded the movement of DEP molecules effectively. For the esterified starch-based film (G80 ES) with an amylose and amylopectin ratio of 80%, despite the presence of microcrystals, the molecular interaction was weak, the size of ordered aggregation region was small, and the highest amount of DEP migrated. Therefore, plasticizer migration can be reduced by controlling the amylose/amylopectin ratio in esterified starch-based film. These results provide the basic data and theoretical basis for a more reasonable design and safe application of starch-based film as packaging materials.

国家自然科学基金项目（31271824、21376095）；教育部新世纪优秀人才计划项目（NCET-12-0193）