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Abstract:
A broad range of ceramic compositions, centered about silicon carbide, can be produced from polymethylsilane polymers. This family of polymers is prepared by redistribution of methylchlorodisilanes. Quarternary phosphonium salt catalysis leads to a methylchloropolysilane intermediate which is derivatized with organo-magnesium (Grignard) reagents. This derivatization replaces the residual Si-Cl ligands with aliphatic or aromatic organic substituents, thus producing the family of polyorganosilane polymers. These polymers can be melt spun, cured in the solid state, and pyrolyzed to produce ceramic fibers. Chemical and physical properties of the silicon carbide-like ceramic fibers produced are described. Methods used to characterize these ceramic fibers includes elemental analysis, density, X-ray diffraction, infrared spectroscopy, (29)Si and (13)C solid state, magic angle spinning, nuclear magnetic resonance, scanning Auger depth profiling, porosity measurements by X- ray scattering, and thermal stability measurements to 1600 C.
| Description: |
Journal article |
| Pages: |
13 |
| Report Date: |
89 |
| Contract Number: |
F33615-83-C-5006 |
| Report Number: |
D389052 |
Report Unavailable |
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