摘要:
A method of making metal nanoparticles and carbon nanotubes is disclosed. A mixture of a transition metal compound and an aromatic polymer, a precursor of an aromatic polymer, or an aromatic monomer is heated to form a metal nanoparticle composition, optionally containing carbon nanotubes.
摘要:
An oligomer having the formula: Ar1 and Ar2 are each an aromatic group or a bisphenol residue. At least one of Ar1 and Ar2 is the aromatic group. The value of m is zero or one, and n is a positive integer. A polymer made by reacting the above oligomer with a crosslinker having at least two silyl hydrogen atoms. A method of: reacting a compound having the formula: with vinyl(dimethylchloro)silane to form the above oligomer. T is —OH, —Br, or —I.
摘要:
A cyanate ester system is disclosed. An aryl ether oligomer may be made from a dihydroxyaromatic compound and a dihaloaromatic compound in the presence of a base. The oligomer is then reacted with a cyanide compound in the presence of a base to form the cyanate ester shown below. The cyanate ester may then be cross-linked to a thermoset having triazine ring cross-links HO—Ar2O—Ar1—O—Ar2nOH.
摘要:
A method of making metal nanoparticles and carbon nanotubes is disclosed. A mixture of a transition metal compound and an aromatic polymer, a precursor of an aromatic polymer, or an aromatic monomer is heated to form a metal nanoparticle composition, optionally containing carbon nanotubes.
摘要:
Disclosed are an oligomer and a phthalonitrile monomer having the formulas: M is a metal or H. The value n is an integer greater than or equal to 1 for the oligomer and greater than or equal to 0 for the phthalonitrile monomer. Ar1 and Ar2 are independently selected aromatic- or heterocyclic-containing groups. Ar1, Ar2, or both are heteroaromatic or heterocyclic groups containing a nitrogen, sulfur, or oxygen heteroatom. Also disclosed are thermosets and pyrolyzed materials made from the phthalonitrile monomer.
摘要翻译:公开了具有下式的低聚物和邻苯二腈单体:M是金属或H.对于低聚物,值n为大于或等于1的整数,对于邻苯二甲腈单体,值大于或等于0。 Ar 1和Ar 2独立地选自芳族或含杂环基团。 Ar 1,Ar 2或两者都是含有氮,硫或氧杂原子的杂芳族或杂环基。 还公开了由邻苯二甲腈单体制备的热固性材料和热解材料。
摘要:
Disclosed is a method of: providing a mixture of a polymer or a resin and a transition metal compound, producing a fiber from the mixture, and heating the fiber under conditions effective to form a carbon nanotube-containing carbonaceous fiber. The polymer or resin is an aromatic polymer or a precursor thereof and the mixture is a neat mixture or is combined with a solvent. Also disclosed are a carbonaceous fiber or carbonaceous nanofiber sheet having at least 15 wt. % carbon nanotubes, a fiber or nanofiber sheet having the a polymer or a resin and the transition metal compound, and a fiber or nanofiber sheet having an aromatic polymer and metal nanoparticles.
摘要:
Compounds having the formulas below. R is an aromatic-containing group. Each M is an alkali metal. Each m is a positive integer. The value of n is a positive integer. The value p is 0 or 1. If p is 0 then n is 1. A thermoset made by curing a composition containing the below phthalonitrile monomers. A method of reacting a diphenyl acetylene compound with an excess of an aromatic diol in the presence of an alkali metal carbonate to form the above oligomer. A method of reacting a phenoxyphthalonitrile with an acetylene compound to form the phthalonitrile monomer below.
摘要:
A method and product thereof made by: reacting a carborane-containing compound and an aromatic compound (below) with a crosslinker having at least two silyl hydrogen atoms. R is alkyl, aryl, alkylaryl, haloalkyl, or haloaryl group. Cb is a divalent carboranyl group. U is an unsaturated hydrocarbon group. Ar1 and Ar2 are each a first aromatic group or a bisphenol residue, where at least one of Ar1 and Ar2 is the first aromatic group. Each Ar is a second aromatic group. Each n is a nonnegative integer. The values n′ and n″ are positive integers and m, 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.
摘要:
An oligomer having the formula: Ar1 and Ar2 are each an aromatic group or a bisphenol residue. At least one of Ar1 and Ar2 is the aromatic group. The value of m is zero or one, and n is a positive integer. A polymer made by reacting the above oligomer with a crosslinker having at least two silyl hydrogen atoms. A method of: reacting a compound having the formula: with vinyl(dimethylchloro)silane to form the above oligomer. T is —OH, —Br, or —I.
摘要:
A carbon nanotube composition and method of making the same. The composition is made by: heating a precursor composition under a non-oxidizing or reducing atmosphere to form a carbon composition of carbon nanotubes and amorphous carbon; and calcining the carbon composition in the presence of oxygen to oxidize and vaporize the amorphous carbon without oxidizing the carbon nanotubes. The precursor composition includes a mixture or complex of a transition metal compound and an organic compound that chars at elevated temperatures.