Silica/poly(styrene-acrylate) nanocomposites were synthesized via two distinct routes: in-situ polymerization and direct mixing techniques. The colloidal stability, damping-acoustic behavior, and mechanical characteristics of the nanocomposite samples were investigated using zeta potential, dynamic-mechanical thermal analysis (DMTA), acoustic test with an impedance tube, and tensile test, respectively. The nanocomposites prepared through the direct mixing technique exhibited enhanced colloidal stability, improved damping and acoustic performance, and superior mechanical properties in comparison to those synthesized via the in-situ polymerization approach.

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