为观测和分析铜掺杂聚-4-甲基-1-戊烯(PMP/Cu)低密度泡沫材料中铜颗粒的三维空间分布,采用高分辨X射线断层扫描技术,扫描PMP/Cu泡沫材料样品,对铜颗粒在聚合物泡沫中的分布进行了成像分析。经过图像处理和三维重构,获得铜颗粒在PMP聚合物泡沫中的三维立体分布图。结果分析显示:铜纳米粒子在PMP泡沫中存在团聚现象;不同尺寸的团聚物形态呈现出明显的多样化特征,小颗粒团聚物趋于球形,大颗粒团聚物趋于不规则的短木棒状,与在电子显微镜下直接观测到的结果一致。研究表明,该技术可以在不破坏样品的前提下,实现对有机聚合物泡沫材料中掺杂金属颗粒空间分布情况的直接观测。

In order to investigate the distribution of copper particles in poly-4-methyl-1-pentene (PMP) low density foams, the high resolution X-ray computer tomography was used to scan PMP/Cu samples and the CCD camera to record the images. After image processing and 3D reconstruction, 3D spatial distribution of the copper particles in PMP/Cu foams was obtained. 3D visualization shows that copper particles are aggregated in the PMP foams, copper particle aggregates with different sizes have distinctly different morphologies, that is, small aggregates tend to be spherical while big aggregates are relatively longer and like a short stick, which agrees well with the results obtained by high resolution electron microscopy. The research results show that the high resolution X-ray computer tomography can be used to observe the high Z metal particles doped in low density porous materials without destructing the samples.