Carborane-(silane or siloxane)-unsaturated hydrocarbon based thermosetting polymers
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsTeddy M. Keller, Leslie J. Henderson
Life of this patent
Estimating the term…
Abstract
This invention relates to a new class of novel inorganic-organic hybrid polymers that are formed from linear inorganic-organic hybrid polymers of varying molecular weight. These new high temperature oxidatively stable thermosetting polymers are formed from linear polymeric materials having repeat units that contain at least one alkynyl group for cross-linking purposes and at least one bis(silyl or siloxanyl)carboranyl group. These novel organoboron thermoset polymers contain an unsaturated cross-linked hydrocarbon moiety.
Claims20
An organoboron thermoset polymer having a repeating unit comprising at least one carboranyl group, one or more silyl or siloxanyl groups, and at least one alkenyl crosslinked functionality.
A method for preparing an organoboron thermoset polymer having the formula (I):
- ##STR21## wherein:
- (1) n is an integer from 1 to 12 and u and y are positive integers;
- (2) ##STR22## represents alkenyl carbon atoms of an alkenyl group represented by ##STR23## in which the alkenyl carbon atoms are directly bonded to alkenyl carbon atoms of other alkenyl groups having the structure ##STR24## of other repeating units according to said formula (I);
- (3) R.sup.1, R.sup.2, R.sup.3 and R.sup.4 represent hydrocarbon moieties or halo-substituted hydrocarbon moieties;
- (4) ##STR25## represents said carboranyl group;
- (5) q and q' are integers from 3 to 16;
- and
- (6) x is an integer greater than or equal to zero;
- comprising the step of:
- heating a carborane-siloxaneacetylenic linear polymer or a carborane-silane-acetylenic linear polymer having the formula:
- ##STR26## 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 when n equals 1 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) ##STR27## represents a carboranyl group;
- (5) q and q' are integers from 3 to 16;
- and
- (6) x is an integer greater than or equal to zero;
- at a temperature, and for a time, sufficient for cross linking of said acetylenic moieties of said linear polymer to form said organoboron thermoset polymer according to said formula (I).
A method for preparing a carborane-siloxane-acetylenic polymer or a carborane-silane-acetylenic polymer having the formula (I):
- ##STR28## wherein:
- (1) n is an integer from 1 to 12 and u and y are positive integers;
- (2) ##STR29## represents alkenyl carbon atoms of an alkenyl group represented by ##STR30## in which the alkenyl carbon atoms are directly bonded to alkenyl carbon atoms of other alkenyl groups having the structure ##STR31## of other repeating units according to said formula (I);
- (3) R.sup.1, R.sup.2, R.sup.3 and R.sup.4 represent hydrocarbon moieties or halo-substituted hydrocarbon moieties;
- (4) ##STR32## represents said carboranyl group;
- (5) q and q' are integers from 3 to 16;
- and
- (6) x is an integer greater than or equal to zero;
- comprising the step of:
- exposing to light a carborane-siloxane-acetylenic linear polymer or a carborane-silane-acetylenic linear polymer having the formula:
- ##STR33## 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 when n equals 1 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) ##STR34## represents a carboranyl group;
- (5) q and q' are integers from 3 to 16;
- and
- (6) x is an integer greater than or equal to zero;
- at a wavelength, and for a time, sufficient to cross-link said acetylenic moieties of said linear polymer thus forming said organoboron thermoset polymer according to said formula (I).
Dependencies are inferred from the claim text.