Claims
- 1. A method of preparing polysilazanes having the repeating structure I ##STR10## which comprises: (a) providing a starting material having the structure II in its molecule ##STR11## in which A is hydrogen, N< or ##STR12## structure II being part of a linear structure or part of a cyclic structure
- (b) providing a catalyst which is effective to activate Si--H, Si--N and/or Si--Si bonds, and
- (c) reacting the starting material in the presence of such catalyst with (1) hydrogen where A is nitrogen and structure II is part of a cyclic silazane or (2) with H--X--H in other cases, X being selected from the group >NH, --NR, --NH--NH--, ##STR13## R being hydrogen or an organic group or a silyl group and R.sup.2 being a bivalent organic group
- (d) thereby forming a polymer having the repeating unit
- --Si--N--.
- 2. The method of claim 1 wherein R is hydrogen or a hydrocarbon group.
- 3. The method of claim 1 wherein the catalyst is a homogeneous catalyst.
- 4. The method of claim 3 wherein the catalyst is a metal complex.
- 5. The method of claim 4 wherein the catalyst is a metal carbonyl cluster.
- 6. The method of claim 1 wherein the catalyst is a heterogeneous catalyst.
- 7. The method of claim 1 wherein the reaction is carried out in an organic solvent at a temperature of about 60.degree. to 150.degree. C.
- 8. The method of claim 1 wherein the starting material is a cyclic silazane and it is reacted with hydrogen.
- 9. The method of claim 1 wherein the starting material is a linear silazane and it is reacted with H--X--H.
- 10. The method of claim 9 wherein H--X--H is ammonia.
- 11. The method of claim 9 wherein H--X--H is a primary amine.
- 12. The method of claim 9 wherein H--X--H is hydrazine or a substituted hydrazine.
- 13. The method of claim 1 wherein the starting material is a cyclic compound containing an Si--Si bond in the ring and it is reacted with H--X--H.
Government Interests
This invention was funded in part by the Office of Naval Research under Contract No. N00014-84-C-0392.
US Referenced Citations (4)