Poly(lactic acid) (PLA) and poly(vinyl alcohol) (PVA) present complementary barrier properties, and their combination in multilayer assemblies (laminates) could provide materials with more effective barrier capacity for food packaging purposes. However, their low chemical affinity compromises adequate polymer adhesion. Surface free energy modification of thermo-processed PLA films through treatment with 1,6-hexanediamine was used to enhance adhesion with polar PVA aqueous solutions. Treatments of 1 and 3 min increased the polar component of the solid surface tension, while treatments above 10 min provoked a corrosive effect in the films’ structure. Extensibility analyses of PVA solutions loaded with carvacrol (15 wt.%) and different Tween 85 ratios on PLA-activated surfaces allowed the selection of the 1-min aminolysed surface for obtaining PLA-PVA bilayers, by casting PVA solutions on the PLA films. This study revealed that despite aminolisation enhancing the PLA surface affinity for aqueous PVA solutions, casting-obtained bilayers presented limited oxygen barrier effectiveness due to heterogeneous thickness of PVA layer in the laminates.

聚乳酸（PLA）和聚乙烯醇（PVA）具有互补的阻隔性能，它们在多层组件（层压板）中的组合可为食品包装目的提供具有更有效阻隔能力的材料。但是，它们的低化学亲和力损害了足够的聚合物粘附性。通过用1,6-己二胺处理对热加工的PLA膜进行表面自由能改性，以增强其与极性PVA水溶液的附着力。1分钟和3分钟的处理增加了固体表面张力的极性成分，而10分钟以上的处理则引起了薄膜结构的腐蚀作用。载有香芹酚（15 wt。通过在PLA膜上浇铸PVA溶液，在PLA活化的表面上使用不同的吐温85比值（Tween 85），可以选择1分钟的氨解表面以获得PLA-PVA双层。这项研究表明，尽管氨基化作用增强了PLA对PVA水溶液的表面亲和力，但由于层压板中PVA层的厚度不均匀，浇铸获得的双层仍显示出有限的阻氧效果。