US4940767A
Expired / Lapsed
US
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Silylene- and disilyleneacetylene polymers from trichloroethylene
Assignee: Iowa State University Research Foundation Inc
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Filing: 1988-08-01
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Granted: 1990-07-10
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Expires: 2008-08-01
Abstract
Abstract Organosilane polymers having recurring silyleneacetylene and/or disilyleneacetylene units are prepared in a one-pot synthesis from trichloroethylene. Depending on the organic substituents (R and R'), these polymers have useful film-forming properties, and are converted to the ceramic, silicon carbide upon heating in very uniform high yields. They can also be pulled into fibers.
Inventors
- 👤 Thomas J. Barton
- 👤 Sina Ijadi-Maghsoodi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:03
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C08; C08G; C08G77/00; C08G77/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
86 words
A method of preparing organosilicon polymers having recurring silyleneacetylene units of the formula: ##STR5## wherein R and R' are organic moieties selected from the group consisting of hydrogen, C 1 to C 20 alkyl, C 6 to C 20 aryl, and C 7 to C 20 alkylaryl and x is an integer from 20 to 500, comprising: reacting trichloroethylene with normal butyllithium to prepare dilithioacetylene; and reacting said dilithioacetylene with a dichlorosilane of the formula: RR'SiCl 2 , wherein R and R' are as previously defined.
Claim 2
Independent Claim
86 words
A method of preparing organosilicon polymers having recurring silyleneacetylene units of the formula: ##STR5## wherein R and R' are organic moieties selected from the group consisting of hydrogen, C 1 to C 20 alkyl, C 6 to C 20 aryl, and C 7 to C 20 alkylaryl and x is an integer from 20 to 500, comprising: reacting trichloroethylene with normal butyllithium to prepare dilithioacetylene; and reacting said dilithioacetylene with a dichlorosilane of the formula: RR'SiCl 2 , wherein R and R' are as previously defined.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the amount of each reactant is at least a stoichiometric amount.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein the reaction is conducted in a suitable reaction promoting organic solvent.
Claim 5
Dependent Claim
19 words
The process of claim 2 wherein the reaction solvent is selected from the group of aliphatic and aromatic hydrocarbons.
Claim 6
Dependent Claim
20 words
The process of claim 3 wherein said solvent is selected from the group consisting of tetrahydrofuran, diethylether, benzene and hexane.
Claim 7
Independent Claim
85 words
A method of preparing organosilicon polymers having recurring disilyleneacetylene units of the formula: ##STR6## wherein R is an organic moiety selected from the group consisting of hydrogen, C 1 to C 20 alkyl, C 6 to C 20 aryl, and C 7 to C 20 alkylaryl and X is an integer from 20 to 500, comprising: reacting trichloroethylene with normal butyllithium to prepare dilithioacetylene; and reacting said dilithioacetylene with a dichlorosilane of the formula: ClR 2 SiSiR 2 Cl, wherein R is as previously defined.
Claim 8
Independent Claim
85 words
A method of preparing organosilicon polymers having recurring disilyleneacetylene units of the formula: ##STR6## wherein R is an organic moiety selected from the group consisting of hydrogen, C 1 to C 20 alkyl, C 6 to C 20 aryl, and C 7 to C 20 alkylaryl and X is an integer from 20 to 500, comprising: reacting trichloroethylene with normal butyllithium to prepare dilithioacetylene; and reacting said dilithioacetylene with a dichlorosilane of the formula: ClR 2 SiSiR 2 Cl, wherein R is as previously defined.
Claim 9
Dependent Claim
17 words
The process of claim 6 wherein the amount of each reactant is at least a stoichiometric amount.
Claim 10
Dependent Claim
17 words
The process of claim 7 wherein the reaction is conducted in a suitable reaction promoting organic solvent.
Claim 11
Dependent Claim
19 words
The process of claim 8 wherein the reaction solvent is selected from the group of aliphatic and aromatic hydrocarbons.
Claim 12
Dependent Claim
20 words
The process of claim 8 wherein said solvent is selected from the group consisting of tetrahydrofuran, diethylether, benzene and hexane.
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