Carborane-(siloxane or silane)-unsaturated hydrocarbon based polymers
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsTeddy M. Keller, Leslie J. Henderson
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Abstract
This invention relates to a new class of novel linear inorganicorganic hybrid polymers of varying molecular weight that are useful for making high temperature, oxidatively stable thermosets, and these novel linear polymers are in themselves oxidatively stable at high temperatures between 600.degree.-1000.degree. C. These new materials have repeat units that contain at least one alkynyl group and at least one bis(silyl or siloxanyl)carboranyl group within the backbone of these novel linear polymers. These novel linear polymers can be further polymerized to form thermosets and ceramics.
Claims20
An organoboron polymer with a backbone having a repeating unit comprising at least one carboranyl group, one acetylenic group, and one or more silyl or siloxanyl groups wherein said repeating unit is represented by the formula:
- ##STR19## wherein:
- (1) n is an integer from 1 to 12 and u and y are positive integers;
- (2) --(C.tbd.C).sub.n -- represents an unconjugated acetylenic moiety or a conjugated acetylenic moiety when n is an integer greater than 1;
- (3) R.sup.1, R.sup.2, R.sup.3 and R.sup.4 represent hydrocarbon moieties or halo-substituted hydrocarbon moieties;
- (4) ##STR20## represents said carboranyl group;
- and
- (5) q and q' are integers from 3 to 16;
- (6) x represents an integer greater than or equal to zero.
A method for preparing a carborane-siloxane-acetylenic polymer or a carboranesilane-acetylenic polymer having the formula:
- ##STR21## to provide said polymer wherein:
- (1) R.sup.1, R.sup.2, R.sup.3 and R.sup.4 represent hydrocarbon moieties or halo-substituted hydrocarbon moieties;
- (2) --(C.tbd.C).sub.n -- represents an unconjugated acetylenic moiety or a conjugated acetylenic moiety when n is greater than 1;
- (3) ##STR22## represents a carboranyl group;
- (4) n is an integer from 1 to 12 and u and y are positive integers and q and q' are integers from 3 to 16;
- and
- (5) x is an integer greater than or equal to zero;
- comprising the step of:
- reacting a salt or a Grignard agent having the formula:
- M--(C.tbd.C).sub.n --M
- wherein:
- (1) M is selected from the group consisting of Li, Na, K and MgX' where X' is selected from the group consisting of F, Cl, Br and I;
- (2) --(C.tbd.C).sub.n -- represents a moiety as previously indicated;
- and
- (3) n is a positive integer as previously indicated;
- with a carborane-siloxane or a carborane-silane having the formula:
- ##STR23## wherein:
- (1) Z represents an acetyl group or a halogen atom selected from the group consisting of F, Cl, Br and I;
- (2) R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as previously indicated;
- and
- (3) x, u, q and q' are integers as previously indicated.
Dependencies are inferred from the claim text.