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首页> 外文期刊>Chemistry of Materials: A Publication of the American Chemistry Society >Efficient Gas and Water Vapor Barrier Properties of Thin Poly(lactic acid) Packaging Films: Functionalization with Moisture Resistant Nation and Clay Multilayers
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Efficient Gas and Water Vapor Barrier Properties of Thin Poly(lactic acid) Packaging Films: Functionalization with Moisture Resistant Nation and Clay Multilayers

机译:聚乳酸包装薄膜的有效气体和水蒸气阻隔性能:具有防潮性和粘土多层的功能化

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摘要

Poly(lactic acid) (PLA) represents one of the most promising and attractive biobased polymer for the industrial development of environmentally sustainable packaging. However, oxygen and water barrier properties of PLA based films cannot compete with those of commercially available composite multilayers. To fill this gap, we used the layer-by-layer deposition technique on commercially used PLA thin films (30 μm thick) in order to increase their barrier properties to oxygen and water vapor. Nanometric films were grown by alternating branched poly (ethylene imine) (BPEI), hydrophobic fluorinated polymer (Nafion), and montmorillonite clay (MMT) layers with the aim of obtaining low gas permeability in both dry and moist conditions as well as low water vapor permeability. Two different kinds of architectures were designed and successfully prepared, based on a 4 layer repeating unit (BPEI/MMT/BPEI/Nafion), represented here as quadlayer (QL), and on a 6 layer repeating-unit ((BPEI/Nafion)2/BPEI/MMT), hexalayer (HL). Reduction in oxygen and water permeabilities is observed for films based on both types of repeat units. The reduction of the permeabilities increases with the number of quad and hexalayers achieving reductions in terms of oxygen permeability in both dry and humid conditions up to 98% and 97% respectively for 10 HL and QL. Furthermore, a reduction of 78% of water vapor transmission rate through the functionalized film was obtained for these films. As far as oxygen permeability is concerned, HL films are more efficient than QL films for smaller numbers of deposition units. These properties are shown to result from the complementarity between the presence of BPEI/Nafion and MMT layers.
机译:聚乳酸(PLA)代表了对环境可持续包装的工业发展而言最有前途和有吸引力的生物基聚合物之一。然而,基于PLA的膜的氧气和水的阻隔性能不能与商业上可获得的复合多层体的氧气和阻水性能竞争。为了填补这一空白,我们在商业用途的PLA薄膜(厚度为30μm)上使用了逐层沉积技术,以提高其对氧气和水蒸气的阻挡性能。纳米膜是通过交替分支支化聚乙烯亚胺(BPEI),疏水性氟化聚合物(Nafion)和蒙脱土(MMT)层而生长的,目的是在干燥和潮湿条件下获得低透气性,并获得低水蒸气渗透性。基于4层重复单元(BPEI / MMT / BPEI / Nafion)(此处表示为四层(QL))和6层重复单元((BPEI / Nafion)),设计并成功制备了两种不同的体系结构2 / BPEI / MMT),六层(HL)。基于两种重复单元类型的膜,观察到氧气和水的渗透性降低。渗透率的降低随着四层和六层的增加而增加,在干燥和潮湿条件下,对于10 HL和QL,氧渗透率分别降低了98%和97%。此外,对于这些膜,通过功能化膜的水蒸气透过率降低了78%。就透氧性而言,对于较少数量的沉积单元,HL薄膜比QL薄膜更有效。这些性能显示是由于BPEI / Nafion层和MMT层之间的互补性造成的。

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