In this study, the effects of the soundproofing properties of polycarbonate (PC), poly(methyl methacrylate) (PMMA), and glass were investigated. We fabricated the specimens into 3 mm thick sheets by direct hot compression molding as a monolithic sample and also by gluing three thin sheets together into a multilayer. Sound transmission loss (STL) was measured by an impedance tube over the frequency range 63-1600 Hz. The results indicate that because of the close density, the STLs for PC and PMMA were almost the same above 1200 Hz. Also, PMMA had a greater STL than PC in the range 63-300 Hz. In a comparison of the monolithic and multilayered samples, we demonstrated that the epoxy-based adhesive interlayers had more efficient bonding than the siliconebased ones. The multilayered polymer/silicone specimens showed a sharp drop in the STL values compared to the monolithic samples. However, the multilayered polymer/epoxy specimens revealed similar behavior to the monolithic polymers. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 42988.
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