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Abstract

The invention provides branched copolymers as precursors for preparing silicon carbide (SiC) ceramics represented by the general formulae:

description='In-line Formulae' end='lead'[Si(˜)RC(˜)H]_xn[SiR₁R₂CH₂]_yn,  Formula Type-Idescription='In-line Formulae' end='tail'

wherein n is the degree of polymerization, 0.1≦x<0.8, 0.2≦y<0.9 and x+y=1; and R=methyl or H, R₁ and R₂ are randomly composed of hydrogen (H), allyl, methyl (Me), phenyl (Ph), propargyl or vinyl. Another branched copolymer is represented by the general formula:

description='In-line Formulae' end='lead'[Si(˜)RC(˜)H]_xn[SiR₁R₂CH₂]_yn[SiR₃R₄CH₂]_zn  Formula Type-IIdescription='In-line Formulae' end='tail'

wherein n is the degree of polymerization, 0.1≦x<0.8, 0≦y<0.8, 0.2≦z<0.8 and x+y+z=1; and R=methyl or H, R₁ and R₂ are randomly composed of hydrogen (H), methyl (Me) and phenyl; R₃ and R₄ are randomly composed of H, allyl, methyl, phenyl (Ph), propargyl, and vinyl. The invention also provides methods for the preparation of such branched copolymers.

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First Claim