Introduction: The aim of the present study was preparing polymeric materials and nanocomposites based on nanoparticles of zinc oxide in normal cases the coated with gelatin and comparing them in terms of sound transmission loss in different frequencies.

 Method: This study was an experimental one. The materials used in the current study were included zinc oxide nanoparticles, polymer polyvinyl chloride (PVC) and the gelatin. The steps of this study were conducted in two phases; the first phase included: making molds and producing nanocomposites and the second phase determining the sound transmission loss in nanocomposites.

Results: Sound transmission loss conventional nanocomposites showed that the highest percentage of the weight in the first and second sound transmission loss in dB in 500 Hz was 4.34. While in the third weight the percent of the nanocomposites, the lowest transmission loss equaled to 0.80 dB at a frequency of 2000 Hz. The results of sound transmission loss in coated gelatin nanocomposites showed that the weight percentage of the first and second was the highest transmission loss equaled to 3.01 dB at a frequency of 500 Hz; and in the third weight percent, the lowest transmission loss equaled to 0.55 dB at a frequency of 2000 Hz, respectively.

Conclusion: Comparing the sound transmission loss in nanocomposites zinc oxide and coated with gelatin normally suggests that the gelatine resulting in increased absorption and sound transmission loss is reduced.