Synthesis of Inorganic Polymers as Gl ass Precursors and for Other Uses. Preceramic Block or Graft Copolymers as Potential Precursors to Nanocomposite Materials

Preceramic block or graft copolymers may offer entree into nanocomposite ceramics provided the two homopolymers are immiscible and one can carefully control the size of the blocks or grafts. We are exploring the possibility of making copolymers from methlsilsesquioxane, -(MeS(O)1.5)(x-), (SiO), a pr...

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Bibliographic Details
Main Authors: Youngdahl, Kay A, Hoppe, Martin L, Laine, Richard M, Rahn, Jeffrey A, Harrod, John F
Format: Report
Language:English
Subjects:
BLACK GLASS
BLACK(COLOR)
BLOCK COPOLYMERS
CATALYSIS
CATALYSTS
CERAMIC MATERIALS
Ceramics, Refractories and Glass
CHEMICAL COMPOSITION
CHEMICALS
CHEMISTRY
COPOLYMERS
DISTRIBUTION
GLASS
GRAFT COPOLYMERS
GRAFT POLYMERIZATION
IMMISCIBLE
Industrial Chemistry and Chemical Processing
INORGANIC POLYMERS
Laminates and Composite Materials
METHYLSILSESQUIOXANE
NANOCOMPOSITE CERAMICS
NANOCOMPOSITE MATERIALS
Polymer Chemistry
POLYMERS
POLYSILANES
POLYSILAZANE
PRECERAMIC COPOLYMERS
PRECERAMIC MATERIALS
PRECURSORS
PYROLYSIS
ROOM TEMPERATURE
SILICON CARBIDES
SILICON NITRIDES
SOLUBILITY
SURGICAL TRANSPLANTATION
SYNTHESIS(CHEMISTRY)
TRANSFORMATIONS
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Summary:Preceramic block or graft copolymers may offer entree into nanocomposite ceramics provided the two homopolymers are immiscible and one can carefully control the size of the blocks or grafts. We are exploring the possibility of making copolymers from methlsilsesquioxane, -(MeS(O)1.5)(x-), (SiO), a precursor to black glass and the polysilazane, -(MeHSiNH)(x-), (SiMe), (SiMe), a precursor to silicon carbide nitride. Our initial efforts have been directed towards delineating the chemical transformations that SiO, prepared by room temperature catalytic redistribution of -(MeHSiO)(x-) using Cp2 TiMe2 as the catalyst (0.1 wt%), undergoes as it is heated to 900 C in N2. We find that although Cp2TiMe2 will not catalyze the redistribution of SiMe at room temperature; in the presence of even small amounts of -(MeHSiO) (x-), it is an active catalyst precursor and copolymer be formed. Spectral and chemical composition studies on the pyrolysis products of the copolymers and SiO are described.