Abstract: The invention involves new syntheses for poly(methyl- and ethyl-silyne). The invention also includes silicon carbide (SiC) ceramics that can be produced from poly(methylsilyne), as well as other ceramics, which can be produced from these precursors by modified processing conditions.

Abstract: High and ultrahigh molecular weight (MW) homo- and copolymers having a three-dimensional random network structure are disclosed. The polymers have recurring structural units of the general formula [AR]n, wherein A can be carbon, silicon, germanium, tin atoms, or other elements and compounds. R can be the same as or different from A (in each repeating unit), and can be hydrogen, saturated linear or branched-chain hydrocarbons containing from about 1 to about 30 carbon atoms, unsaturated ring-containing or ring hydrocarbons containing from about 5 to about 14 carbon atoms in the ring, each in substituted or unsubstituted form, polymer chain groups having at least 20 recurring structural units, halogens, or other elements or compounds. The number “n” can be at least 20, and the high MW polymers have a molecular weight of at least 10,000 daltons, e.g., about 30,000 daltons, and as high as 1,000,000 or more daltons.

Abstract: The invention involves new syntheses for poly(methyl- and ethyl-silyne). The invention also includes silicon carbide (SiC) ceramics that can be produced from poly(methylsilyne), as well as other ceramics, which can be produced from these precursors by modified processing conditions.

Abstract: The invention involves new syntheses for poly(methyl- and ethyl-silyne). The invention also includes silicon carbide (SiC) ceramics that can be produced from poly(methylsilyne), as well as other ceramics, which can be produced from these precursors by modified processing conditions.

Abstract: High and ultrahigh molecular weight (MW) homo- and copolymers having a three-dimensional random network structure are disclosed. The polymers have recurring structural units of the general formula [AR]n, wherein A can be carbon, silicon, germanium, tin atoms, or other elements and compounds. R can be the same as or different from A (in each repeating unit), and can be hydrogen, saturated linear or branched-chain hydrocarbons containing from about 1 to about 30 carbon atoms, unsaturated ring-containing or ring hydrocarbons containing from about 5 to about 14 carbon atoms in the ring, each in substituted or unsubstituted form, polymer chain groups having at least 20 recurring structural units, halogens, or other elements or compounds. The number “n” can be at least 20, and the high MW polymers have a molecular weight of at least 10,000 daltons, e.g., about 30,000 daltons, and as high as 1,000,000 or more daltons.

Abstract: Synthesis and characterization of polycarbynes, a new class of carbon-based random network polymers. The network backbones of the polymers are composed of tetrahedrally hybridized carbon atoms, each bearing one substituent and linked via three carbon-carbon single bonds into a three-dimensional continuous random network backbone. Silicon, germanium, tin, lead, Group 13 through Group 16 elements, lanthanides, and Group 4 metals can be incorporated into the polymer backbone. The atomic-level carbon network backbone confers unusual properties on the polymers, including thermal decomposition to form diamond or diamond-like carbon.

Abstract: A process for the addition of functional groups to polysilyne polymers is disclosed. A solution of a poly(phenylsilyne) polymer is reacted with triflic acid. The reaction product is then reacted with a reagent selected from the group consisting of an alkyllithium reagent, a Grignard reagent, an alkoxide salt, and an amide salt to form a resultant polysilyne polymer. The resultant polysilyne polymer may be pyrolyzed to form a silicon-based ceramic.

Abstract: The present invention is directed to a process for the formation of an isolable C.sub.

Abstract: The present invention is directed to high-coordination transition metal complexes, i.e., those of coordination number seven and above, and the use thereof in the room temperature/atmospheric pressure formation of carbon-carbon bonds via reductive coupling of linear carbon-containing ligands, and methods for the isolation and recovery of the newly formed C.sub.2 containing species.