Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 97, Issue 6, Pages 2382-2386Publisher
WILEY
DOI: 10.1002/app.21854
Keywords
epoxy resins; mechanical properties; modeling; nanocomposites; silica nanoparticles
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Silica nanoparticles having different sizes were obtained by the sol-gel process and characterized. The prepared nanoparticles were subsequently used as reinforcing fillers to prepare epoxy-based composites with a silica content ranging from I to 5 wt %. SEM analysis and tensile tests carried out on the silica-epoxy nanocomposites indicated the absence of particle aggregation and a reinforcing effect in terms of increased elastic modulus. Mechanical properties were also modeled by using a finite element code able to construct a numerical model from a microstructural image of the material. A more reliable model was prepared by considering the presence of an interphase layer surrounding the particles with intermediate elastic properties between the epoxy and the inclusions and a characteristic size proportional to the particle radius. (c) 2005 Wiley Periodicals, Inc.
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