Three-dimensional structure of a polymer/clay nanocomposite characterized by transmission electron microtomography
Three-dimensional structure of a polymer/clay nanocomposite characterized by transmission electron microtomography
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通过透射电子显微断层扫描表征聚合物/粘土纳米复合材料的三维结构
DOI：
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
H. Jinnai
中科院分区：
文献类型：
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作者：
H. Nishioka;K. Niihara;T. Kaneko;J. Yamanaka;Takashi Inoue;T. Nishi;H. Jinnai
用透射电子显微镜(TEMT)研究了聚合物/粘土纳米复合材料--有机蒙脱土(MMT)分散在乙烯-乙酸乙烯酯共聚物(EVA)中的三维形态。使用这种技术，分散在EVA基质中的单个粘土层被清晰地显示出来。由3D重建图像估算的粘土层的体积分数与根据MMT/EVA体系中蒙脱土组分的重量计算的体积分数符合得很好。通过一种新开发的3D粒子算法对单独的粘土层进行数字提取。通过三维重建直接得到粘土层的尺寸分布。各粘土层的各向异性通过确定相同体积的近似椭球体的三个半轴来表征。利用椭球体的一个典型半轴来估算TEMT实验中超薄切片中蒙脱土薄膜的平均取向。因此，定量TEMT和三维结构分析的结合被证明是研究蒙脱土分布与纳米复合材料各种物理性能之间关系的有力工具。
Three-dimensional (3D) morphology of a polymer/clay nanocomposite, an organophilic montmorillonite (MMT) dispersed in poly(ethylene-co-vinylacetate) (EVA), was examined by transmission electron microtomography (TEMT). Using this technique, individual clay layers dispersed in the EVA matrix were clearly visualized. A volume fraction of the clay layers evaluated from the 3D reconstructed image agreed well with that calculated from the weight of the MMT component in the MMT/EVA system. The individual clay layers were digitally extracted by a newly developed 3D particle algorithm. A size distribution of the clay layers was directly obtained from the 3D reconstruction. Anisotropy of each clay layer was characterized by the determination of three semi-axes of an approximating ellipsoid with the same volume. One of the representative semi-axis of the ellipsoid was used to estimate average orientation of the MMT layers in the ultra-thin section used in the TEMT experiment. Thus, the combination of quantitative TEMT and 3D structural analysis is shown to be a powerful tool to investigate a relationship between the MMT distribution and a variety of physical properties of the nanocomposites.
直接测量双连续嵌段共聚物形态中的界面曲率分布。
DOI：
10.1103/physrevlett.84.518
发表时间：
2000
期刊：
Physical review letters.
影响因子：
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作者：
Jinnai,H;Nishikawa,Y;Spontak,RJ;Smith,SD;Agard,DA;Hashimoto,T
通讯作者：
Hashimoto,T