High Temperature Elastomers from Linear Poly(silarylene-Siloxane-Acetylene)
Patent Application, Filed 25 Jul 2000
DEPARTMENT OF THE NAVY WASHINGTON DC
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The invention relates generally to linear polymers that can be cured to form high temperature elastomers and plastics, and in particular to a high temperature elastomer made by curing linear to polysilarylene-siloxane-acetylene. The aerospace industry has a continuing demand for high performance materials that can withstand extreme variations of temperatures. In particular, there is a need for materials that have elastomeric properties, that have thermal, thermo-oxidative and hydrolytic stability at high temperatures as high as 300 - 350 deg C and that maintain their flexibility below ambient temperatures. For example, fuel tanks of high flying airplanes and space vehicles require sealants that maintain elasticity for up to 10,000 hours of use at temperatures that range from -60 deg C to 400 deg C. Further, the material must resist swelling when coming into contact with jet fuel and must have excellent adhesion to and inertness toward metallic substrates.
- Elastomers and Rubber