Abstract
Microfibrous thin films (mu FTFs) of Parylene C are deposited to a thicknesses of about 100 mu m by physicochemical vapor deposition with the intention of determining the sound absorption of these films in the lower audible frequency range. The objective is to determine the sound absorption by the mu FTFs by using dynamic loading experiments. The mu FTFs were subjected to cyclic elastic loads in the frequency range of 5 to 200 Hz over a temperature range of 25 to 50 degrees C to determine their dynamic moduli and thus extract the Parylene-C mu FTFs sound absorption properties. The absorption coefficient of microfibrous Parylene-C is found to be weakly dependent on temperature, however it increases with increasing frequency. Peaks in the spectra of the absorption coefficient were attributed to resonant coupling between incident sound waves and vibrating microfibers.