Process for producing carbon fiber

Details Process for producing carbon fiber Process for producing carbon fiber

1977-03-23

1978-12-26

Woo, Jay H.

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

264 292, 4234472, 4234474, C01B 3107

Patent

active

041316444

ABSTRACT:
Carbon fibers having excellent modulus of elasticity and tensile strength are produced in a high yield by a process wherein polybutadiene fibers are prepared by melt-spinning polybutadiene having at least 85% of vinyl structure, a melting point of at least 100.degree. C and a reduced viscosity of 0.3 to 1.2 dl/g; the fibers are then treated in a solution or suspension of a Lewis acid in an inert organic liquid, whereby the pollybutadiene is cyclized and cross-linked; the polybutadiene fibers treated as mentioned above are further treated in a melted sulphur or a sulphur-containing solution at a temperature of 170 to 300.degree. C, whereby the cyclized and cross-linked polybutadiene is dehydrogenated and aromatized; and the fibers treated as mentioned above are carbonized by raising the temperature thereof to 750.degree. C to 3000.degree. C to form carbon fibers or graphite fibers. If so desired, the ordinary carbon fibers which have been produced at 750 to 1500.degree. C, can be converted to graphite fibers by heating them to a temperature of 1500 to 3000.degree. C.

REFERENCES:
patent: 3720759 (1973-03-01), Overhoff
patent: 3928544 (1975-12-01), Yokota et al.
patent: 3937775 (1976-02-01), Horikiri et al.

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