摘要:
A phthalonitrile compound having the formula below. The value n is a positive integer. Each R has a hydrocarbon chain optionally having —O— or —SiR′2—O—. Each R′ is an aliphatic group. Each Ar is an aromatic group with the proviso that Ar contains at least two aromatic rings when n is 1 and R is an alkylene group. A method of: reacting an excess of a dihydroxyaromatic compound with a dihalocompound to form an oligomer; and reacting the oligomer with 4-nitrophthalonitrile to form the phthalonitrile compound, where Ar is an aromatic group.
摘要:
A composition having nanoparticles of a refractory-metal carbide or refractory-metal nitride and a carbonaceous matrix. The composition is not in the form of a powder. A composition comprising a metal component and an organic component. The metal component is nanoparticles or particles of a refractory metal or a refractory-metal compound capable of decomposing into refractory metal nanoparticles. The organic component is an organic compound having a char yield of at least 60% by weight or a thermoset made from the organic compound. A method of combining particles of a refractory metal or a refractory-metal compound capable of reacting or decomposing into refractory-metal nanoparticles with an organic compound having a char yield of at least 60% by weight to form a precursor mixture.