Microwave absorbing properties of structural nanocompositeswith surface treated Co ferrite nanoparticles as filler

摘要

An analysis of the microwave absorbing properties of several polymer-(epoxy) based nanocomposites is presented. Thenanoparticles of interest for this study were cobalt ferrite nanoparticles. For better dispersion of the nanoparticles in thepolymer matrix surface treatment of the nanoparticles with silane compounds was performed. The nanoparticles weresurface-treated with 3-glycidoxypropyl- (GPTMS), aminopropyl- (APTMS) or methyl-silsesquioxane (MTMS). Thenanoparticles with GPTMS-coating dispersed well in epoxy without sedimentation while the other nanoparticles formedagglomerates in epoxy. The GPTMS-based composites showed higher fracture toughness than the MTMS-basedcomposites. The microwave properties, permittivity and permeability, of GPTMS-based composites were measured inthe frequency range between 3.95 GHz and 18 GHz and showed no influence of surface treatment on permeability.