Evidence of the interphase in epoxy nanocomposites
Evidence of the interphase in epoxy nanocomposites
复制标题
环氧纳米复合材料中界面的证据
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
J. Kindersberger
中科院分区：
文献类型：
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作者：
J. Seiler;J. Kindersberger
通过在聚合物绝缘材料中添加纳米填料来改善电性能归因于在填料颗粒和聚合物基质之间形成的界面区域，即界面。尽管有几种模型描述了界面相，但到目前为止还没有提供直接的证据证明它存在于环氧纳米复合材料中。本研究的目的是使界面可见。为此，用原子力显微镜(AFM)和电场力显微镜(EFM)研究了纳米二氧化硅颗粒本身和嵌入在环氧纳米复合材料中的相同类型的二氧化硅颗粒。在EFM图像中，当填充颗粒嵌入到复合材料中时，它们看起来比没有嵌入时更大。这种大小的差异归因于填料颗粒周围的界面。通过比较填料颗粒本身的尺寸和嵌入复合材料中的填料颗粒的大小，估计出界面的厚度。研究表明，在环氧树脂纳米复合材料中，填料颗粒周围可以形成界面相，AFM和EFM测量是使界面相可见的合适方法。
The improvement of electrical properties by adding nanoscale fillers to polymeric insulating materials is attributed to an interfacial area, the interphase, which is formed between the filler particles and the polymer matrix. Despite there are several models describing the interphase, a direct evidence for its existence in epoxy nanocomposites has not been provided so far. It is the aim of the present study to make the interphase visible. For this purpose nanoscale silica particles themselves and the same type of silica particles embedded in an epoxy nanocomposite were investigated by Atomic Force Microscopy (AFM) and Electric Force Microscopy (EFM). In the EFM images the filler particles appear larger when they are embedded in the composite material than they do when they are not embedded. This difference in size is attributed to the interphase surrounding the filler particles. By comparing the size of the filler particles themselves and the filler particles embedded in the composite material the thickness of the interphase is estimated. From the investigations it turns out that an interphase may be formed around filler particles in epoxy nanocomposites, and that AFM and EFM measurements are an appropriate method to make the interphase visible.