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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Effect of Highly Exfoliated and Oriented Organoclays on the Barrier Properties of Polyamide 6 Based Nanocomposites
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Effect of Highly Exfoliated and Oriented Organoclays on the Barrier Properties of Polyamide 6 Based Nanocomposites

机译：高度剥落和定向的有机粘土对聚酰胺6基纳米复合材料阻隔性能的影响

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摘要

The influence of the incorporation of nano-particles (organo-modified montmorillonite Cloisite 30B) in polyamide 6 (PA6) on the transport of small molecules was investigated. Nanocomposites were prepared by melt blending followed by cast extrusion for obtaining film-forming materials. The nanoclay content of the materials was varied from 0 to 5 vol%. Differential scanning calorimetry measurements, electronic microscopy, X-ray diffraction, and rheology were used for characterizing the nanocomposite structure. Because of the presence of nanofillers, a high barrier effect to nitrogen and water was clearly evidenced and mainly attributed to the increase of tortuosity because of the increase of the diffusion pathway generated by impermeable nanofillers. In this study, the high barrier effect was attributed to the very good dispersion of montmorillonite platelets in the PA6 matrix resulting from a two-step melt processing. This peculiar processing has induced a good exfoliation and an orientation parallel to the film surface of lamellar montmorillonite platelets which is clearly demonstrated from transmission electron microscopy analysis. The permeation results were evaluated on the basis of geometrical models proposed by Nielsen and Bharadwaj, and by analyzing the plasticization phenomenon in the case of water permeation involving a concentration-dependence diffusivity correctly approached by an exponential law.
机译：研究了在聚酰胺6（PA6）中掺入纳米颗粒（有机改性的蒙脱土Cloisite 30B）对小分子运输的影响。纳米复合材料是通过熔融共混然后浇铸挤出制得的，用于获得成膜材料。材料的纳米粘土含量在0至5体积％之间变化。差示扫描量热法测量，电子显微镜，X射线衍射和流变学用于表征纳米复合结构。由于存在纳米填料，因此清楚地证明了对氮和水的高阻隔作用，这主要归因于由于不可渗透的纳米填料产生的扩散途径的增加，曲折度的增加。在这项研究中，高阻隔作用归因于蒙脱石血小板在两步熔融过程中在PA6基质中的良好分散。这种特殊的处理过程引起了良好的剥落和平行于层状蒙脱土血小板膜表面的取向，这在透射电子显微镜分析中得到了明显证明。在Nielsen和Bharadwaj提出的几何模型的基础上评估渗透结果，并通过分析水分渗透情况下的增塑现象，涉及涉及浓度依赖扩散系数的指数法，这种渗透率是正确的。

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