High temperature elastomers from linear poly (silarylene-siloxane-acetylene)
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsTeddy M. Keller, Craig Homrighausen
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Abstract
A linear polymer has repeating units represented by the formula wherein (a) n is an integer greater than or equal to 0, (b) x is an integer greater than or equal to 1, and represents an unconjugated acetylenic group when x is equal to 1 or conjugated acetylenic groups when x is greater than 1; (c) Ar is an aromatic group, and (c) R1, R2, R3, R4, R5, R6, R7 and R8 are independently selected from the group consisting of alkyl, aryl, alkylaryl, haloalkyl, haloaryl, and mixtures thereof. The linear polymer may be thermally cured to form a crosslinked polymer.
Claims17
A crosslinked polymer made by a process comprising the step of thermally curing a linear polymer that comprises repeating units represented by the formula
- wherein
- (a) n is an integer greater than or equal to 0,
- (b) x is an integer greater than or equal to 1, and
- represents an unconjugated acetylenic group when x is equal to 1 or conjugated acetylenic groups when x is greater than 1;
- (c) Ar is an aromatic group, and
- (c) R1, R2, R3, R4, R5, R6, R7 and R8 are independently selected from the group consisting of alkyl, aryl, alkylaryl, haloalkyl, haloaryl and mixtures thereof.
A crosslinked polymer made by a process comprising the step of thermally curing a linear polymer that comprises repeating units represented by the formula
- wherein n is an integer greater than or equal to 0, and R1, R2, R3, R4, R5, R6, R7 and R8 are independently selected from the group consisting of alkyl, aryl, alkylaryl, haloalkyl, haloaryl and mixtures thereof.
A crosslinked polymer made by a process comprising the step of thermally curing a linear polymer that comprises repeating units represented by the formula
- wherein n is an integer greater than or equal to 0.
A crosslinked polymer made by a process comprising the steps of
- (a) reacting hexachlorobutadiene with n-butyl lithium to form 1,4-dilithio-1,3-butadiyne,
- (b) reacting the 1,4-dilithio-1,3-butadiyne of step (a) with (dimethylamino) (R9-disubstituted)chlorosilane, wherein each R9 independently selected from the group consisting of alkyl, aryl, alkylaryl, haloalkyl, haloaryl and mixtures thereof, to form 1,4-bis(dimethylamino, R9-disubstituted-silyl)butadiyne,
- (c) reacting 1,4- bis(hydroxy-R10-disubstituted-silyl)-Ar, wherein Ar is an aromatic group, wherein R10 is selected from the group consisting of alkyl, aryl, alkylaryl, haloalkyl, haloaryl and mixtures thereof, with bis(dimethylamino)R11-disubstituted-silane, wherein R11 is selected from the group consisting of alkyl, aryl, alkylaryl, haloalkyl, haloaryl and mixtures thereof, to form a prepolymer of the formula:
- wherein n is an average value greater than or equal to 0, and wherein the value of n is controlled by selecting the initial molar ratio of 1,4- bis(hydroxy-R10-disubstituted-silyl)benzene Ar and bis (dimethylamino)R11-disubstituted-silane,
- (d) reacting the prepolymer of step (c) with the 1,4-bis(dimethylamino, R9-disubstituted-silyl)butadiyne of step (b) to form a linear polymer, and
- (e) thermally curing the linear polymer of step (d).
A crosslinked polymer made by a process comprising the steps of
- (a) reacting hexachlorobutadiene with n-butyl lithium to form 1,4-dilithio-1,3-butadiyne,
- (b) reacting the 1,4-dilithio-1,3-butadiyne of step (a) with (dimethylamino)dimethylchlorosilane to form 1,4-bis(dimethylaminodimethylsilyl)butadiyne,
- (c) reacting 1,4-bis(hydroxydimethylsilyl)benzene with bis(dimethylamino)dimethylsilane, to form a prepolymer of the formula:
- wherein n is an average value greater than or equal to 0, and wherein the value of n is controlled by selecting the initial molar ratio of 1,4-bis(hydroxydimethylsilyl)benzene and bis(dimethylamino)dimethylsilane,
- (d) reacting the prepolymer of step (c) with the 1,4-bis(dimethylaminodimethylsilyl)butadiyne of step (b) to form the a linear polymer, and
- (e) thermally curing the linear polymer.
Dependencies are inferred from the claim text.