摘要:
A compound having the formula below. Each R is methyl or phenyl; R2 comprises one or more of silane, siloxane, and aromatic groups; n is a nonnegative integer; and m is 1 or 2. The dashed bond is a single bond and the double dashed bond is a double bond, or the dashed bond is a double bond and the double dashed bond is a triple bond. A polymer made by a hydrosilation reaction of a polyhedral oligomeric silsesquioxane having pendant siloxane groups with an acetylene- and silicon-containing compound having at least two vinyl or ethynyl groups, and a crosslinked polymer thereof. The reaction occurs between the pendant siloxane groups and the vinyl or ethynyl groups.
摘要:
A compound having the formula: 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′-difluorobenzophenone with a vinyl dialkylsilane. Each R is an independently selected alkyl group.
摘要:
A method and a ceramic made therefrom by: providing a composition of a compound having the formula below and a metallic component, and pyrolyzing the composition. R is an organic group. The value n is a positive integer. Q is an acetylenic repeat unit having an acetylene group, crosslinked acetylene group, (MLx)y-acetylene complex, and/or crosslinked (MLx)y-acetylene complex. M is a metal. L is a ligand. The values x and y are positive integers. The metallic component is the (MLx)y-acetylene complex in the compound or a metallic compound capable of reacting with the acetylenic repeat unit to form the (MLx)y-acetylene complex. The ceramic comprises metallic nanoparticles.
摘要:
A ceramic made by providing a composition and pyrolyzing the composition. The composition has siloxane polymer, metallic polymer, siloxane thermoset, and/or metallic thermoset having a backbone having: an acetylenic repeat unit; and —SiR2—(O—SiR2)n— and/or —SiR2—(O—SiR2)n-[Cb-SiR2—(O—SiR2)n]m—. R is an organic group, Cb is a carborane, and n and m are integers greater than or equal to zero. Any crosslinking is a crosslink between acetylene groups and/or a polycarbosiloxane crosslink. The composition also has free metal atoms, metal clusters, or metal nanoparticles dispersed homogeneously throughout the composition; (MLx)y-acetylene complex in the backbone; and/or a metallic compound for forming a (MLx)y-acetylene complex. M is a metal, L is a ligand, x and y are positive integers.
摘要:
A compound having the formula: 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′-difluorobenzophenone with a vinyl dialkylsilane. Each R is an independently selected alkyl group.
摘要:
An aromatic ether oligomer or polyaromatic ether comprising the formula: O—Arn; wherein Ar is an independently selected divalent aromatic radical; formed by reacting a dihydroxyaromatic with a dihaloaromatic; and wherein the reaction is performed in the presence of a copper compound and cesium carbonate. The polyaromatic ether is formed when neither the dihydroxyaromatic nor the dihaloaromatic is present in an excess amount. The aromatic ether oligomer is formed by using an excess of either dihydroxyaromatic or dihaloaromatic. A phthalonitrile monomer comprising the formula: formed by reacting a 3- or 4-nitrophthalonitrile with a hydroxy-terminated aromatic ether oligomer. A thermoset formed by curing the phthalonitrile monomer. Processes for forming all the above.
摘要:
A method and a ceramic made therefrom by: providing a composition of a compound having the formula below and a metallic component, and pyrolyzing the composition. The value n is a positive integer. Q is an acetylenic repeat unit having an acetylene group, crosslinked acetylene group, (MLx)y-acetylene complex, and/or crosslinked (MLx)y-acetylene complex. M is a metal. L is a ligand. The values x and y are positive integers. The metallic component is the (MLx)y-acetylene complex in the compound or a metallic compound capable of reacting with the acetylenic repeat unit to form the (MLx)y-acetylene complex. The ceramic comprises metallic nanoparticles.
摘要:
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.
摘要:
A process of making metal nanoparticles 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 metal nanoparticles. A metal nanoparticle composition comprising metal nanoparticles dispersed homogenously in a matrix selected from the group consisting of ethynyl polymer, crosslinked ethynyl polymer, amorphous carbon, carbon nanotubes, carbon nanoparticles, graphite, and combinations thereof.