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Carboranylcyclotriphosphazenes and their polymers. [thermal insulation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Allcock, H. R. Scopelianos, A. G. Obrien, J. P. |
| Copyright Year | 1981 |
| Description | Carboranyl-substituted polyphosphazenes are prepared by heat polymerizing a carboranyl halocyclophosphazene at 250 C for about 120 hours in the absence of oxygen and moisture. The cyclophosphazene is obtained by allowing a lithium carborane, e.g., the reaction product of methyl-o-carborane with n-butyllithium in ethyl ether, to react with e.g., hexachlorocyclotriphosphazene at ambient temperatures and in anhydrous conditions. For greater stability in the presence of moisture, the chlorine substituents of the polymer are then replaced by aryloxy or alkoxy groups, such as CF3CH2O. The new substantially inorganic polymers are thermally stable materials which produce a high char yield when exposed to extreme temperatures, and can thus serve to insulate less heat and fire resistant substances. |
| File Size | 323297 |
| Page Count | 4 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19820010515 |
| Archival Resource Key | ark:/13960/t21c6t11k |
| Language | English |
| Publisher Date | 1981-09-08 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Hygral Properties Phosphorus Polymers Alkyl Compounds Thermal Insulation Polymerization Combustion Products Carborane Cyclic Compounds Phosphazene Lithium Compounds Thermal Stability Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
