Enhancement of Epoxy-derived Polymer Nanocomposites Strengthened with Titanium Dioxide (TiO2) and Silicon Oxide (SiO2) Nanoparticles

Abstract This work investigates the mechanical characteristics of epoxy nanocomposites reinforced with titanium dioxide (TiO 2 ) and silicon oxide (SiO 2 ) nanoparticles. The intrinsic brittleness and low impact resistance of neat epoxy resin limit its use in high-performance settings, despite its benefits, which include high stiffness, chemical stability, and thermal resistance. The inclusion of nano-sized reinforcements was investigated as a solution to these constraints, with the objective of improving the impact, tensile, flexural, and compressive qualities of epoxy-based composites. The presence of nanoparticles significantly improved all tested properties, according to mechanical characterization. The tensile strength of the nanocomposites increased from 67 MPa for pure epoxy to 84 MPa for the composite that contained 2 wt.% TiO 2 and 1 wt.% SiO 2 . The flexural strength of the nanocomposites increased by 242.5% (from 73 MPa for pure epoxy to 250 MPa for the composite). The compressive strength and strain tolerance of all nanocomposite samples have significantly improved, and stress increases nearly monotonically with strain. This enhancement is ascribed to improved interfacial bonding between the nanoparticles and matrix, which promoted energy dissipation during fracture. Improved interfacial bonding and particle dispersion in low to moderately filled systems were confirmed by morphological analysis using SEM and EDX, which also showed uniform distribution and little void formation. These improved epoxy nanocomposites are especially well-suited for structural uses in the automotive, marine, and aerospace industries where durability and high strength-to-weight ratios are crucial. They are also perfect for protective coatings and electronic encapsulants in harsh environments due to their enhanced impact resistance and surface hardness.