The development of biopolymer films is crucial for the replacement of conventional plastics. Tremendous effort is made to improve their performances by introducing biopolymers through the film manufacturing process. Herein, a sandwich-architectured film was proposed to efficiently improve the adhesion between the PS and PLA layers by using octenyl succinic anhydride-modified pea starch (OMPS) layer as the interlayer, leading to a highly mechanically enhanced interpenetrating network. Accordingly, the properties of the films were enhanced due to the synergism effect of sandwich architecture. In particular, the WVP value of the sandwich-architectured films (0.25 ∼ 0.89×10⁻¹⁰ $\text{g}·m^{-1}·s^{-1}·{Pa}^{-1}$) decreased more than 7-fold compared with the OMPS20 film, and the OP value of the sandwich-architectured films (0.256 ∼ 1.229×10^-12 ${cm}^3·\text{m}·m^{-2}·s^{-1}·{Pa}^{-1}$) decreased more than 10-fold in comparison to the PLA film. Benefitting from the characteristics investigated above, the films exhibited a favorable effect on strawberry storage. Overall, the fabricated eco-friendly sandwich-architectured films have shown great potential for biodegradable packaging applications.

生物聚合物薄膜的开发对于替代常规塑料至关重要。通过在膜制造过程中引入生物聚合物，人们做出了巨大的努力来改善其性能。本文中，提出了一种夹心结构的膜，以通过使用辛烯基琥珀酸酐改性的豌豆淀粉（OMPS）层作为中间层来有效地改善PS和PLA层之间的粘合性，从而获得高度机械增强的互穿网络。因此，由于夹心结构的协同作用，膜的性能得到增强。特别是，夹心结构膜的WVP值（0.25〜0.89×10 ^-10 $\text{G}·{米}^{--\mathrm{1个}}·s^{--\mathrm{1个}}·{P\mathrm{一种}}^{--\mathrm{1个}}$）与OMPS20薄膜相比下降了7倍以上，并且夹心结构薄膜的OP值（0.256〜1.229×10 ^-12 ${C米}^3·\text{米}·{米}^{--2}·s^{--\mathrm{1个}}·{P\mathrm{一种}}^{--\mathrm{1个}}$）与PLA薄膜相比下降了10倍以上。得益于以上研究的特性，这些膜对草莓的贮藏表现出有利的作用。总体而言，所制造的环保型三明治结构薄膜在生物可降解包装应用方面显示出巨大潜力。