Ultrasonic transmission is a clean, non-damaging technique for characterization of polymer emulsions and dispersion systems. Propagation of ultrasonic wave was examined utilizing pulse – echo method using 2 MHz frequency and temperature 300oK. Polymeric nanocomposites using different monomer composition of methyl methacrylate (MMA) & butylacrylate (BuA) monomers in presence of different concentrations of titanium dioxide (TiO2) nanoparticles via emulsion polymerization technique using ultrasonic waves as initiation systems for different time intervals were prepared and characterized by (TGA), X-ray analysis and particle size analysis using transmission electron microscope (TEM). The obtained results showed that the particles of the prepared nanocomposite samples in the nano-sized diameter ranged between 46.5 – 71.5 nm. The ultrasonic velocity, density and viscosity of the prepared nanocomposite samples were measured at various concentrations. From the data, ultrasonic factors such as ultrasonic attenuation (α) , adiabatic compressibility (β), acoustic impedance (Z), and stiffness constant (c) have been predestined by standard relations. These results are interpreted in terms of molecular interaction between the components of the mixture. The variation of β, Z, τ, α and c with concentration have been studied. The results have been compared with those obtained from various theories and the results are analyzed and interpreted in terms of molecular interactions.