Cross-linked organosilazane polymers
AssigneeE. I. Du Pont de Nemours and Company
InventorsJohn D. Bolt, Frederick N. Tebbe
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Abstract
Cross-linked organosilazane polymers which are useful as ceramic precursors and film casting are disclosed.
Claims26
A polymer comprising a plurality of precursor residues comprising repeat units of the formula ##STR3## said precursor residues being linked together by at least one bridge of the formula --MR'.sub.n --;
- said bridge or bridges being attached to nitrogen atoms of the repeat units wherein the formulas
- R is independently selected from the group consisting of hydrogen, alkyl groups having from 1 to 6 carbon atoms, substituted and unsubstituted phenyl groups, substituted and unsubstituted napthyl groups, substituted and unsubstituted biphenyl groups, substituted and unsubstituted allyl groups, substituted and unsubstituted alkylaryl groups having from 7 to 18 carbon atoms, and substituted and unsubstituted vinyl groups;
- R' is independently selected from the group consisting of hydrogen, lower alkyl groups having from 1 to about 6 carbon atoms provided that the alkyl group has no .beta.-hydrogen atoms when M is Ti, Zr, or Hf, and mono- and di- aryl- or alkylamino, alkylphenyl, and alkylaryl groups;
- M is a metal independently selected from Groups IIIA, IIB, IVB and IIA of the Periodic Table, provided that M is not Hg;
- n is an integer less than or equal to the valence of M;
- and
- a is an integer greater than 1.
A process for preparing a polymer comprising contacting a plurality of precursor residues comprising repeat units of the formula ##STR4## with a metallic reagent of the formula MR'.sub.x, wherein the formulas R is independently selected from the group consisting of hydrogen, alkyl groups having from 1 to 6 carbon atoms, substituted and unsubstituted phenyl groups, substituted and unsubstituted napthyl groups, substituted and unsubstituted biphenyl groups, substituted and unsubstituted allyl groups, substituted or unsubstituted aryl groups having from 6 to about 12 carbon atoms, and substituted and unsubstituted vinyl groups;
- R' is independently selected from the group consisting of hydrogen, lower alkyl groups having from 1 to about 6 carbon atoms provided that the alkyl group has no .beta.-hydrogen atoms when M is Ti, Zr, or Hf, and mono- and di-aryl- or alkylamino, alkylphenyl, and alkylaryl groups;
- M is a metal independently selected from Groups IIIA, IIB, IVB or IIA of the Periodic Table, provided that M is not Hg;
- x is an integer less than or equal to the valence of M;
- and
- a is an integer greater than 1.
Dependencies are inferred from the claim text.