Abstract
Nanodiamond (ND) powder was successfully activated by wet chemical method and by exposure of UV/O3 in a chamber followed by mixing in triethylenetetramine (TETA) solution. The reinforcement role of activated ND in the mechanical properties of epoxy matrix was studied. Both treatments, i.e. acid and UV/O3 provide ND surface with chemical functionalities for adhesion with epoxy resin. Fourier transform infrared spectroscopy was utilized to confirm the attachment of surface groups to the ND particles. The low content of acid and UV/O3 activated ND was dispersed ultrasonically in the epoxy matrix separately to make nanocomposites. The mechanical properties of the nanocomposites were investigated under three point bending. The strong interactions among activated ND particles and the epoxy resin provide efficient load transfer interfaces, which enhances the mechanical properties of the composites. It was found that the flexural strength, modulus, and toughness of 0.1 wt% ND loaded nanocomposites have been enhanced up to 85%, 57%, and 39%, respectively for UV/O3 treated ND powder. It is also found that the optimum ND concentration to achieve maximum reinforcement is 0.1 wt% while higher concentrations lead to decrease in mechanical properties. The significant improvement of the mechanical properties of the ND/epoxy nanocomposites is attributed to the good dispersion of the functionalized ND in epoxy matrix.
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