Conductive Three-Dimensional Lamella Network for Improved Sound Absorption and Heat Transfer

Abstract

Recently, the quality of life of human has been increasingly threatened by noise caused by various surroundings. To prevent damage from noise, research is being conducted on materials that are capable of both blocking noise in a wide frequency range and transferring frictional heat generated from the noise blocking. In this study, using porous melamine foam (MF) as the basic material, a three-dimensional (3D) lamellar structure with excellent sound absorption and thermal conductivity was manufactured using the dipping process and vapor deposition polymerization, respectively. The 3D lamella structure shows excellent sound absorption performance in a wide frequency range of 250–6300 Hz, and in particular, has a sound absorption coefficient value of 0.96 at 4000 Hz. Due to the coating of the structure using polypyrrole as a conductive polymer, it has a higher thermal conductivity value (0.286 W m–1 K–1) than MF (0.033 W m–1 K–1). This structure also has high structural stability and elastic recovery performance, so it has the same mechanical performance, even after 500 repeated deformations.