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METHOD OF PRODUCING CARBON FIBERS FROM MULTIPURPOSE COMMERCIAL FIBERS

United States Patent Application

20170191194
A1
View the Complete Application at the US Patent & Trademark Office
A method of producing carbon fibers includes the step of providing polyacrylonitrile precursor polymer fiber filaments. The polyacrylonitrile precursor filaments include from 87-97 mole % acrylonitrile, and less than 0.5 mole % of accelerant functional groups. The filaments are no more than 3 deniers per filament. The polyacrylonitrile precursor fiber filaments can be arranged into tows of at least 150,000 deniers per inch width. The arranged polyacrylonitrile precursor fiber tows are stabilized by heating the tows in at least one oxidation zone containing oxygen gas and maintained at a first temperature T1 while stretching the tows at least 10% to yield a stabilized precursor fiber tow. The stabilized precursor fiber tows are carbonized by passing the stabilized precursor fiber tows through a carbonization zone. Carbon fibers produced by the process are also disclosed.
Jackson, Connie D. (Harriman, TN), Naskar, Amit K. (Nashville, TN)
15/ 395,926
December 30, 2016
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH [0002] This invention was made with government support under contract No. DE-AK-000R22725 awarded by the U.S. Department of Energy. The government has certain rights in this invention.