Abstract
In this study E-glass/Epoxy/MWCNT nanocomposites were produces by modifiying E-glass/epoxy composites with multi-walled carbon nanotubes (MWCNT). Metal/nanocomposite sandwich panels were obtained by bonding banocomposites with brass, copper and aluminum. The aim of study is to determine the bending strength values of sandwich panels in these three different design parameters experimentally. The nanocomposites forming the core part of the sandwich panels are reinforced with 330 g/m2 unidirectional E-glass fabrics. The resin that forms the matrix part of nanocomposites is a diglycidyl ether bisphenol A type epoxy. The purity of carbon nanotubes used as modification material is 98%, inner diameters of 5-10 nanometers, outer diameters of 10-20 nanometers and 0,5-2 micrometers. Carbon nanotubes functionalized as –OH were imported from Switzerland. Interfacial bonds between matrix an reinforcement elements are one of the most important points for a composite. The balanced transfer of the load from the matrix to the fibers increases some of the strength values of the composite. Carbon nanotubes are chemically bonded to epoxy resin with functional (-OH) groups and physically stuck to E-glass fibers acting as a bridge, increasing the quality of the interface. The ability of carbon nanotubes to fulfill these functions is directly related to their homogeneous mixing within the resin. After the resin hardener mixture is made 70-30%, the nanoparticles added at 0.5% by weight are mechanically 20 min. have been mixed for time. The mixture is applied to E-glass fabrics with a hand palette and then 30 min. to allow the resin to diffuse into the fabric thoroughly has been suspended. These wet fabrics were cured in four layers [0]4 with hot press molding at 100 °C and 7 bar pressure. Cured plates and brass, copper aluminum plates were sized with water jet to test sample dimensions (100x20). Brass, copper and aluminum forming the outer laminate of the sandwich panel and the nanocomposite material forming the core are bonded with methyl methacrylate with two components. Finally, the three-point bending tests of these sandwich panels are the most resistant to bending with 33 MPa, Aluminum-Glass fiber/Epoxy/MWCNT then 11 MPa, Copper-Glass fiber/Epoxy/MWCNT and 10 MPa were determined.
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