We report in this article the results of nanosilica (SiO 2 )-filled epoxy composites with different loadings and their electrical, thermal, mechanical, and free-volume properties characterized with different techniques. The morphological features were studied by transmission electron microscopy, and differential scanning calorimetry was used to investigate the glass-transition temperature (T g ) of the nanocomposites. The properties of the nanocomposites showed that the electrical resistivity (q), ultimate tensile strength, and hardness of the composites increased with SiO 2 weight fraction up to 10 wt % and decreased thereafter; this suggested that the beneficial properties occurred up to this weight fraction. The temperature and seawater aging had a negative influence on q; that is, q decreased with increases in the temperature and aging. The free-volume changes (microstructural) in the composite systems correlated with seawater aging but did not correlate so well with the mechanical properties.
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