Fabrication of benzbisazole polymers into monolithic articles
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorsHoe H. Chuah, Ivan J. Goldfarb
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Abstract
A method for fabricating a monolithic polybenzbisazole article including the steps of: (a) dissolving at least one benzbisazole polymer in a strong acid at an elevated temperature; (b) transferring the resulting solution to a mold; (c) cooling the solution in the mold to a temperature below the gelation temperature of the acid-polymer mixture, thus providing a polymer-acid gel; (d) ageing the gel for about 0.25 to 10 days; (e) replacing the acid in the gel with water; (f) replacing the water in the gel with a lower aliphatic alcohol; and (g) densifying the gel.
Claims5
A method for fabricating a monolithic polybenzbisazole article comprising the steps of:
- (a) dissolving at least one benzbisazole polymer in a strong acid at an elevated temperature;
- (b) transferring the resulting solution to a mold;
- (c) cooling the solution in mold to a temperature below the gelation temperature of the acid-polymer mixture, thus providing a polymer-acid gel;
- (d) ageing the gel for about 0.25 to 10 days;
- (e) replacing the acid in the gel with water thus providing a coagulated gel;
- (f) replacing the water in the gel with a lower aliphatic alcohol;
- and
- (g) densifying the gel, thus providing said monolithic article.
Dependencies are inferred from the claim text.