Influence of carbon black fillers on acoustic properties of polychloroprene (neoprene) elastomers

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Abstract
The effects of carbon black type and loading, and variation of base polymer, on a series of polychloroprene rubbers (neoprenes) have been investigated. Two common types of neoprenes, each with a lead oxide cure system, were used. The acoustic responses of these materials were characterized for extensional wave propagation in air by a resonance technique and longitudinal wave propagation in water through the use of a high-frequency sing-around device and an underwater acoustic impedance tube. The viscoelastic properties of neoprene elastomers were found to be strongly influenced by both the degree of loading and average particle size of the carbon black used. The results are discussed in terms of mechanisms of interaction between the carbon black filler and the gum phase of the elastomer.

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