Experimental investigation on pore size effect on the linear viscoelastic properties of acoustic foams

Abstract

This paper presents linear viscoelastic measurement on a large frequency range (10−2–108 Hz) for cross-linked polymer open-cell foams of same density and different pore sizes. This large extension of frequency range is obtained by the validation of a frequency-temperature superposition principle, commonly used with polymers. At higher frequencies, the shear moduli are independent of the pore size. In acoustical insulation range (1 Hz–16 kHz), the shear moduli decreases with the foams’ pore size.