This work was done to improve the interfacial adhesion and engineering performance of polyvinyl alcohol/polylactic acid laminate film by altering the polyvinyl alcohol phase surface properties via incorporating microfibrillated cellulose modified by propionylation. Incorporating the modified microfibrillated cellulose into polyvinyl alcohol film improved adhesion between film layers during the laminating process. Improved peel strength and tensile properties confirmed that modified microfibrillated cellulose can produce better bonding between polyvinyl alcohol and polylactic acid via mechanical interlocking and cohesive forces at the film interface. Modified microfibrillated cellulose (3 wt%) increased the peel strength by 40% comparing with the neat polyvinyl alcohol/polylactic acid laminate film.The reduction of both moisture absorption and diffusion rate of the modified microfibrillated cellulose–polyvinyl alcohol/polylactic acid to 20 and 23%, respectively, also indicated that the modified microfibrillated cellulose could inhibit moisture permeation across the film. This was because the modified microfibrillated cellulose is hydrophobic. Furthermore, the addition of modified microfibrillated cellulose also increased the decomposition temperature of the laminate film up to 10% as observed at 20% of remaining weight, while the storage modulus substantially increasing to 72% relative to the neat laminate film.The superior interfacial adhesion between the polylactic acid and modified microfibrillated cellulose–polyvinyl alcohol layers, observed by scanning electron microscopy, confirmed the improved compatibility between the polyvinyl alcohol and polylactic acid phases.

中文翻译：

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改性微纤化纤维素填充聚乙烯醇/聚乳酸层压薄膜的界面粘合性和工程性能的增强

完成这项工作是为了通过加入丙酰化改性的微纤化纤维素来改变聚乙烯醇相的表面特性，从而改善聚乙烯醇/聚乳酸层压膜的界面粘合性和工程性能。将改性微纤化纤维素掺入聚乙烯醇薄膜中，可提高层压过程中薄膜层之间的附着力。剥离强度和拉伸性能的提高证实，改性微纤化纤维素可以通过薄膜界面的机械互锁和内聚力在聚乙烯醇和聚乳酸之间产生更好的粘合。与纯聚乙烯醇/聚乳酸层压膜相比，改性微纤化纤维素 (3 wt%) 的剥离强度提高了 40%。改性微纤化纤维素-聚乙烯醇/聚乳酸的吸湿率和扩散速率分别降低到 20% 和 23%，这也表明改性微纤化纤维素可以抑制水分渗透穿过薄膜。这是因为改性微纤化纤维素是疏水的。此外，在剩余重量为 20% 时观察到的，改性微纤化纤维素的添加还使层压膜的分解温度提高了 10%，而储能模量相对于纯层压膜显着增加到 72%。 优异的界面粘合性在聚乳酸和改性微纤化纤维素-聚乙烯醇层之间，通过扫描电子显微镜观察，