Closed‐cell foams based on rigid polyurethanes blended with more viscoelastic polymers possess good vibration‐damping properties. The damping characteristics of the various polymers differ, indicating that the chemical nature has an influence on the acoustical performance of the blend. Damping is also temperature dependent. By selection of polymers, foam effective for damping at various service temperatures and over various frequency ranges can be made. The damping characteristics of polymers can be changed by adding fillers. Such methods may be employed to achieve a broader damping peak at the desired service temperature. The damping of vibration of an aluminum strip could be increased by one to two orders of magnitude between 20°C to 60°C when the strip was coated with the experimental materials in comparison with commercial open‐cell, elastic foams of comparable density. A dynamic resilience of only 9% was achieved.
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Chen et al. (1976) studied this question.
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