چكيده به لاتين
Today, carbon-based nanoparticles, especially carbon nanotubes (CNTs), have become particularly important due to their unique properties. Numerous studies have shown that the addition of CNT to polymer matrices, including epoxy, which is one of the most widely used polymers, increases their properties and performance. However, CNT particles have a high tendency to clump and this prevents a uniform distribution in the matrix. In this study, CNT was modified by two methods of acid washing and help of silane agents. The effect of time (1, 2 and 3 hours ultrasound) and weight percentage of nanoparticles (0.5, 1, 2 and 3) on the characteristics of functionalized particles and performance of epoxy nanocomposite containing CNT acid-washed was investigated. Also, the effect of the concentration of silane agents in aqueous solution during the surface modification reaction and the weight percentage of nanoparticles (0.5, 1 and 2) on the performance of epoxy nanocomposites containing CNT modified with silane was evaluated. Finally, the performance of epoxy nanocomposites containing two types of surface-modified CNT was compared with agent-free CNT and nanoparticle-free epoxy. Modified CNTs were analyzed by FTIR, TGA Raman, XRD, SEM, and titration and stability tests in solvent. Epoxy nanocomposites containing CNT and surface modified CNTs were also evaluated by mechanical tensile, flexural, compressive and DSC, DMTA and FESEM analyzes. The results showed that in both methods, the functional groups successfully grafted on the CNT surface. Tensile strength and tensile modulus were 53% and 57% higher than those for epoxy, respectively, and 63% and 13% higher, respectively, for epoxy-modified silane. Flexural strength and flexural modulus were 47% and 60% higher for amino silane than epoxy, respectively, and 100% and 11% higher for GLYEO silane. Also, the storage modulus and glass transition temperature for both silane samples increased compared to pure epoxy. According to the DSC analysis, the silane nanocomposites cured better and the resulting heat was higher than that of pure epoxy, and the curing temperature increased somewhat.
