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Use of pre-defined architectures for incorporation of aligned carbon nanotubes into epoxy resin

Carbon nanotubes have been reported to possess outstanding mechanical properties, making them candidates for the next generation of high performance composites. Unfortunately, due to inconsistent nanotube quality, weak interfacial bonding and poor dispersion, current nanotube-based composites fail to realise their anticipated potential. In this study consistent quality nanotubes have been deposited onto preformed substrates of mesh and wire using an optimised large scale catalytic chemical vapour phase deposition apparatus. The bi-directional planar system of nanotubes has then been integrated into an epoxy matrix. This study investigates the interfacial shear strength between aligned carbon nanotubes and epoxy resin. Optimisation of this interfacial region influences the mechanical behaviour of composite materials and has considerable industrial applications in the aerospace and manufacturing industries. The surface chemistry of nanotubes was modified by plasma treatment and monitored using X-ray photoelectron spectroscopy. Mechanical testing with a custom designed adhesiometer suggested a possible improvement in interfacial shear strength. Optical microscopy was used to determine the failure mechanisms between the carbon nanotube and epoxy resin.