Castable and High Modulus Acoustic Dampening Material
Patent application, filed 22 Feb 2007
DEPARTMENT OF THE NAVY WASHINGTON DC
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A dampening material is presented with a carboxy-terminated-butadiene nitrile CTBN as a dampening element. The glass transition temperature of the CTBN is generally at room temperature. The material is a two-component system with micro-scale phase segregation. The CTBN is reacted into an epoxy resin at a high temperature- and- cooled to allow the epoxy to react-with a curing agent. A phase segregation occurs - between the epoxy and the CTBN as the epoxy gelscures. The extent of phase separation in the reaction is controlled by cross-linking and gelling. The rubbery component of CTBN phase segregates and forms discrete, spherical domains. Because the glass transition temperature of the rubbery domains is in the operational temperature range of interest,- the composite is - capable of absorbing acoustic energy. A high modulus allows a larger amount of acoustic energy to enter the composite where it is absorbed by the rubbery CTBN component.
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