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首页> 外文期刊>Composites Science and Technology >Multi-scale interphase construction of self-assembly naphthalenediimide/multi-wall carbon nanotube and enhanced interfacial properties of high-modulus carbon fiber composites
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Multi-scale interphase construction of self-assembly naphthalenediimide/multi-wall carbon nanotube and enhanced interfacial properties of high-modulus carbon fiber composites

机译：自组装萘二酰亚胺/多壁碳纳米管的多尺度界面构造及高模量碳纤维复合材料的增强界面性能

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摘要

Amino terminated and pi-conjugate naphthalenediimide (NDI) was designed and novel interphase with self-assembled NDI/multi-wall carbon nanotube (MWNT) was constructed on high-modulus carbon fiber (HMCF) surface, and the interfacial properties and reinforcing mechanisms of HMCF composites with various interphase were investigated. The nanoscale stiffening interphase with intertwined MWNT and flat ensiform nanostructure from NDI self-assembly were observed on MWNT@HMCF and NDI@HMCF surface, while multi-scale stiffening interphase with oblique ensiform nanostructure was constructed on NDI/MWNT@HMCF surface which was based on NDI self-assembly under confinement constraint of MWNT substrate. Compared to Pristine HMCF and MWNT@HMCF composites, the TFBT strength and IFSS of NDI@HMCF and NDI/MWNT@HMCF composites were improved by effective buffered load from stiffened interphase and smooth transition of modulus between carbon fiber and epoxy matrix. The schematic models of interphase reinforcing mechanisms were proposed as bulk failure in NDI@HMCF composite and cohesive failure in NDI/MWNT@HMCF composite, which were attributed to the shift of stress concentration and crack propagation from HMCF surface toward modulus platforms amongst nanoscale and multi-scale stiffening interphase.
机译：设计了具有氨基末端的π共轭萘二酰亚胺（NDI），并在高模量碳纤维（HMCF）表面上构建了具有自组装NDI /多壁碳纳米管（MWNT）的新型相界面，并研究了其界面性质和增强机理。研究了具有不同界面相的HMCF复合材料。在MWNT @ HMCF和NDI @ HMCF表面观察到了由NDI自组装而缠结的MWNT和平坦的固态纳米结构的纳米级加劲相，而在NDI / MWNT @ HMCF表面的基础上构造了具有倾斜的固态纳米结构的多级加劲相。 MWNT基板约束条件下NDI自组装研究与原始的HMCF和MWNT @ HMCF复合材料相比，NDI @ HMCF和NDI / MWNT @ HMCF复合材料的TFBT强度和IFSS通过硬化相间的有效缓冲载荷和碳纤维与环氧基质之间模量的平稳过渡而得到改善。提出了相间强化机理的模型，即NDI @ HMCF复合材料的整体破坏和NDI / MWNT @ HMCF复合材料的内聚破坏，这归因于应力集中和裂纹从HMCF表面向模量平台在纳米级和多级模中的转移。尺度的硬化相。

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