Abstract:
A method of: reacting a dihydroxybenzene with bromine to form a bromodihydroxybenzene; reacting the bromodihydroxybenzene with trifluoromethanesulfonyl chloride or trifluoromethanesulfonic anhydride to form a bromotrifluorometiianesulfonatobenzene; and reacting the bromotrifluoromethanesulfonatobenzene with phenyl acetylene to form a phenyl ethynylbenzene.
Abstract:
A composition having nanoparticles of a refractory-metal boride and a carbonaceous matrix. The composition is not in the form of a powder. A composition comprising a metal component, boron, 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, boron, and an organic compound having a char yield of at least 60% by weight to form a precursor mixture. A composition having nanoparticles of a refractory-metal boride that is not in the form of a powder.
Abstract:
Disclosed herein are the compounds shown below. Each R is an organic group, Cb is a carborane group, and -C6H4- is phenylene. The value of each m is a nonnegative integer, q is 0 or 1, with the proviso that if q is 0 then m is 0 or 1, p is a positive integer, r is a positive integer, and n is an integer greater than or equal to 10. Also disclosed are methods of making and crosslinking the compounds. -{SiR 2 -([0] q -SiR 2 ) m -[Cb-SiR 2 -([0] q -SiR 2 ) m ] p -C≡C-C6H4-C≡C}- -{SiR 2 -(0-SiR 2 )m-C≡C-C 6 H 4 -C≡C} n -; -{SiR 2 -([0] q -SiR 2 ) m -[C≡C-C 6 H 4 -C≡C-SiR 2 -([0] q -SiR 2 ) m ] p -Cb-[SiR 2 -([0] q -SiR 2 ) m -Cb] r }-
Abstract:
A method of: providing a solution of: a dichloroaromatic compound having an electron-withdrawing group bound to each aromatic ring containing one of the chloride groups; an excess of a dihydroxyaromatic compound; a base; and a solvent; heating the solution to a temperature at which the dichloroaromatic compound and the dihydroxyaromatic compound react to form an aromatic ether oligomer; and reacting the aromatic ether oligomer with a chlorodialkylvinylsilane to form one or more vinyl-terminated compounds having the formula below. The aromatic ether oligomer is a dihydroxy-terminated compound or a dimetallic salt thereof. Water formed during the heating is concurrently distilled from the solution. Each R is an alkyl group, Ar 1 is a residue from the dichloroaromatic compound, Ar 2 is a residue from the dihydroxyaromatic compound, and n is a non-negative integer.
Abstract:
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.
Abstract:
A compound having the formula: (Formula 1), Each Ar is an aromatic group. Each R is an alkyl group. The value n is a positive integer. The values of w, x, y, and z are 0 or 1. If y is 0 than x and z are 0 and w is 1, and if y is 1 than x and z have different values and w equals z. A thermoset made by crosslinking a silane-containing compound with the above compound. A method of making the above compound when y is 1 by: reacting 4,4'-difluorobenzophenone with an aromatic diol to form an oligomer; and reacting the oligomer with a vinyl dialkylsilane. A method of making the below compound by: reacting 4,4'-difluorobenzophcnonc with a vinyl dialkylsilane. Each R is an independently selected alkyl group. (formula 2)
Abstract:
A process of making carbon nanotubes comprising the steps of: providing a precursor composition comprising at least one metallic compound and at least one organic compound; wherein the organic compound is selected from the group consisting of an ethynyl compound, a metal-ethynyl complex, and combinations thereof; wherein the precursor composition is a liquid or solid at room temperature; and heating the precursor composition under conditions effective to produce carbon nanotubes. A carbon nanotube composition comprising carbon nanotubes and a metal component selected from the group consisting of metal nanoparticles and elemental metal; wherein the carbon nanotube composition is rigid.
Abstract:
A process of making metal nanoparticles comprising the steps of:aproviding a precursor composition comprising at least one metallic compound and at least one organic compound; wherein the organic compound is selected from the group consisting of an ethynyl compound, a metal-ethynyl complex, and combinations thereof; wherein the precursor composition is a liquid or solid at room temper ature; and heating the precursor composition under conditions effective to produce metal nanoparticles. A metal nanoparticle composition comprising metal nanopraticles dispersed homogenously in a matrix selected from the group consisting of ethynyl polymer, crosslinked ethynyl polymer, amorphous carbon, carbon nanotubes, c arbon nanoparticles, graphite, and combinations thereof.
Abstract:
A compound having: one or more of the below repeat units, one or more terminating Ar-NH- groups bound to carbon radicals, and one or more terminating -H groups bound to nitrogen radicals. Each R is an organic group and each Ar is an aromatic group. The compound is not a thermoset. A method of: mixing an aromatic amine having the formula Ar-NH2 with a phthalonitrile compound, heating the mixture to form the compound described above (Eq. 1), and cooling the mixture before the onset of gelation.
Abstract:
A composition having nanoparticles of silicon carbide and a carbonaceous matrix or silicon matrix. The composition is not in the form of a powder. A composition having silicon and 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 silicon and the organic compound and heating to form silicon carbide or silicon nitride nanoparticles.