Motedayen Ali Akbar, Rezaeigolestani Mohammadreza, Guillaume Carole, Guillard Valérie, Gontard Nathalie
UMR IATE, INRA 2 Place Pierre Viala F-34060 Montpellier Cedex France.
UMR IATE, University of Montpellier 2 Place Pierre Viala F-34060 Montpellier Cedex 1 France
RSC Adv. 2019 Apr 9;9(19):10938-10947. doi: 10.1039/c9ra01109a. eCollection 2019 Apr 3.
The gas (O and CO) permeability of an innovative stratified PE-organoclay (LLDPE/OMMT) nano-enabled composite films was studied for the first time and related to the self-assembly process driven by hydrophobic interactions. An 84.4% and a 70% reduction ( a barrier improvement factor of about 6, sufficient for food packaging applications) were observed respectively in the oxygen and carbon dioxide permeability of the 5 bilayers coated film compared to the substrate, while only incorporating 2.4 v/v% of organoclay in the composite and increasing the thickness by 17.7%. Such drastic effect with so low amount of organoclays cannot be achieved by conventional melt blending/exfoliation of the clays into the polymer matrix and is due to a geometrical blocking effect of a brick-wall and compact layer structure of the impermeable clay tactoids. Mathematical prediction of oxygen barrier performance of PE/OMMT films has revealed that 12 bilayers would be necessary to further achieve a barrier improvement factor of 10.
首次研究了一种创新的分层聚乙烯-有机粘土（线性低密度聚乙烯/有机蒙脱土）纳米复合薄膜的气体（氧气和二氧化碳）渗透性，并将其与疏水相互作用驱动的自组装过程相关联。与基材相比，5层涂层薄膜的氧气和二氧化碳渗透率分别降低了84.4%和70%（阻隔改善系数约为6，足以满足食品包装应用），而复合材料中仅含有2.4 v/v%的有机粘土，厚度增加了17.7%。通过将粘土常规熔融共混/剥离到聚合物基体中，无法用如此少量的有机粘土实现这种显著效果，这是由于不可渗透的粘土片层的砖墙和致密层结构的几何阻挡效应。对聚乙烯/有机蒙脱土薄膜氧气阻隔性能的数学预测表明，要进一步实现阻隔改善系数为10，需要12层。
