Abstract
In this work, a novel, simple and scalable methodology, based on in-situ shear assisted solvent exchange in two phases, is used to disperse functionalized carbon nanofibres (CNF) within epoxy. Critical stress intensity factor, KIC, of composites prepared using this method was more than 2.2 times higher than that of neat epoxy at just 0.5-1 wt% filler content. This ranks amongst some of the highest increases observed for such class of nano-composite systems. In comparison to conventional surfactant assisted processing, results from this method showed significantly higher dispersion, adhesion, and fracture resistance. The high dispersion and matrix-filler interactions is further is also indicated by calorimetric and spectroscopic analysis, and evidenced by an increase in the glass transition temperature by almost 10 °C with respect to control through the addition of 1 wt% CNF. The method presented herein is expected to be applicable to a wide array of quasi-isotropic nanocomposite epoxy systems.
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