On the asymptotic solution of sound penetration into a rigid porous half-plane: A modified saddle point method

Characterization of the Structure, Acoustic Property, Thermal Conductivity, and Mechanical Property of Highly Expanded Open‐Cell Polycarbonate Foams

“…However, to the best of our knowledge, all PC foams investigated in the literature either are closed cells foams or those with open‐cell, their sound and thermal insulation behavior were not scientifically examined. Closed cell foams would show a reasonable thermal insulating behavior, but their sound insulation properties would, as usual, be very low . For sound waves to be attenuated by the foam, cells must be interconnected so that air particles can pass through them …”

“…Closed cell foams would show a reasonable thermal insulating behavior, but their sound insulation properties would, as usual, be very low. [10][11][12] For sound waves to be attenuated by the foam, cells must be interconnected so that air particles can pass through them. [13,14] Various processing routes have been used for achieving open-cell plastic foams.…”