✦ LIBER ✦

Thermally and oxidatively stable thermosets derived from preceramic monomers

✍ Scribed by Daniel Bucca; Teddy M. Keller

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 147 KB
Volume: 35
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(19970430)35:6<1033::aid-pola6>3.0.co;2-5

No coin nor oath required. For personal study only.

✦ Synopsis

Monomers 1,3-bis(4-phenylethynylphenyl)tetramethyldisiloxane and 1,7bis(4-phenylethynylphenyltetramethyldisiloxyl)-m-carborane were synthesized and compared with bis(4-phenylethynylphenyl)dimethylsilane as potential preceramic precursors. These monomers were heated to free flowing liquids above 100ЊC and thermally polymerized above 300ЊC to form heat-resistant thermosets or ceramic residues. The ceramic yields for the silane (13%) and siloxane (30%) were much lower than that for the carborane (64%) monomer. The thermoset and ceramic made from the carborane monomer were the best thermally and oxidatively stable materials. After curing, the thermoset had a weight loss of only 6% and after pyrolysis, the ceramic residue had no additional weight loss up to 1000ЊC in air.

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