Interpenetrating Polymer Network Acoustic Damping Material.
Patent, Filed 28 Aug 91, patented 6 Jul 93,
DEPARTMENT OF THE NAVY WASHINGTON DC
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Improved acoustic damping materials comprise interpenetrating polymer networks having a soft polymer component and a hard polymer component. The soft polymer component, constituting from 50 to 90, preferably 70, percent by weight of the material, is made by polymerizing an aromatic diisocyanate with a polyalkylene ether glycol, and the hard polymer component is a vinyl ester polymer made by polymerization of a vinyl ester resin such as the acrylate or methacrylate ester of the diglycidyl ether of a polyphenol. Optionally, the vinyl ester resin may be brominated, whereby increased fire retardance is conferred upon the interpenetrating polymer network. The mixture is cured at room temperature.
- Polymer Chemistry
- Fluid Mechanics
- Organic Chemistry