| 초록 |
In this work, red mud (RM) surfaces are treated with silane coupling agent containing epoxy ring, amine, or acrylate groups to improve interfacial adhesion in the epoxy/RM nanocomposites. The changes of surface properties of the RM and structures of the nanocomposites are investigated in terms of zeta-potential, x-ray diffraction (XRD) and scanning electron microscopy (SEM). The mechanical properties of nanocomposites are tested in short-beam three-point bending and impact energies. As a result, surface treatments lead to an increase of organic functional groups and, especially in case of amino silane, play an important role in improving zeta-potential due to an increase of surface acidity of RM. In addition, the results show that the impact energies and ductilities of epoxy/treated RM nanocomposites are more improved than those of epoxy/untreated RM composites. This is due to the enhancement of the degree of adhesion at the interface between RM surface and matrix by silane treatments.
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