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Synthesis of inorganic polymers as glass precursors and for other uses: Pre‐ceramic block or graft copolymers as potential precursors to composite materials
Author(s) -
Youngdhal K A,
Hoppe M L,
Laine R M,
Rahn J A,
Harrod J F
Publication year - 1993
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.590070808
Subject(s) - copolymer , ceramic , catalysis , polymer , silicon carbide , nanocomposite , redistribution (election) , chemistry , pyrolysis , composite number , chemical engineering , polymer chemistry , nitride , silicon nitride , carbide , materials science , silicon , composite material , organic chemistry , layer (electronics) , politics , political science , law , engineering
Pre‐ceramic block or graft copolymers may offer entrée 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 methylsilsesquioxane, [MeSi(O) 1.5 ] x , (SiO), a precursor to ‘black glass’ and the polysilazane, [MeHSiNH] x , (SiMe), a precursor to silicon carbide nitride. Our initial effors have been directed towards delineating the chemical transformations that SiO, prepared by room‐temperature catalytic redistribution of [MeHSiO] x using Cp 2 TiMe 2 as the catalyst (0.1 wt %), undergoes as it is heated to 900 °C in nitrogen. We find that, although Cp 2 TiMe 2 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 a copolymer can be formed. Spectra and chemical composition studies on the pyrolysis products of the copolymers and SiO are described.