Abstract The toughness mechanisms of epoxy-based nanocomposites reinforced by double-walled carbon nanotubes (DWCNT) are investigated using Raman microscopy mapping. Maps of the residual strain of the carbon nanotubes were generated for the fracture surfaces obtained after tensile loading. By imaging through different microscope objectives, Raman mapping allowed to determine the distribution of the nanotube residual strain, indicating tension or compression, in different sampling volumes near the fracture surface. The G′ band with its high sensitivity to nanotube diameter variations, and not overlapping with the characteristic epoxy Raman lines, was selected for the mapping. Results provide a quantitative analysis of the nanotube bridging and pull-out mechanisms identified by scanning electron microscopy (SEM) inspection of the fracture surfaces.

中文翻译：

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使用拉曼显微镜绘制拉伸载荷后 DWCNT/环氧树脂纳米复合材料中碳纳米管的残余应变

摘要 使用拉曼显微镜测绘研究了双壁碳纳米管 (DWCNT) 增强的环氧基纳米复合材料的韧性机制。为拉伸加载后获得的断裂表面生成碳纳米管的残余应变图。通过不同的显微镜物镜成像，拉曼映射允许确定纳米管残余应变的分布，表明在断裂表面附近的不同采样体积中，纳米管残余应变是拉伸或压缩。选择对纳米管直径变化具有高灵敏度且不与特征环氧树脂拉曼线重叠的 G' 带进行映射。结果提供了对通过断裂表面的扫描电子显微镜 (SEM) 检查确定的纳米管桥接和拔出机制的定量分析。