Abstract
This paper presents a new concept of forming 3D hierarchical carbon nanotube (CNT) and carbon fiber (CF) reinforced composites by using a low temperature grafting method that connects CNTs to CF surface by covalent bonding. By using amorphous carbon to join the free ends of two cantilever CNTs, it is shown via in situ scanning electron microscope (SEM) pulling out experiments that the strengths at the joint between CF-CNT and CNT-CNT junction are high and breakage occurs in CNT itself. This offers evidence that the maximum load in a typical bridging load-displacement curve could be increased, which in turn can potentially increase intralaminar and interlaminar fracture toughness of 3D multiscale CNT-CF reinforced composites.
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