Epoxy foams with tunable acoustic absorption behavior

摘要

Herein, epoxy foams with tunable acoustic behavior were innovatively fabricated via non-traditional expandable microspheres. By adjusting the preparation parameters, changes in cellular structure from closed cells to partial open cells were observed, which exhibited tunability and resulted in diverse sound absorption behaviors. Short procuring time, high microsphere contents and foaming temperatures contribute to constructing more open cells and enhancing the sound absorption properties. High absorption coefficient up to 0.75 is achieved. Such a novel light-weight epoxy foam can serve as a promising structural and sound-proof material, and satisfy the needs of many multifunctional systems including vehicles, buildings, aircrafts, etc. (C) 2017 Elsevier B.V. All rights reserved.