Method of carbonizing polyacrylonitrile fibers

Details Method of carbonizing polyacrylonitrile fibers Method of carbonizing polyacrylonitrile fibers

1981-07-10

1983-05-24

Meros, Edward J.

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

4234472, 4234477, D01F 922

Patent

active

043850430

ABSTRACT:
This invention relates to a method of carbonizing polyacrylonitrile fibers (PAN fibers) by exposing the fibers at an elevated temperature to an oxidizing atmosphere, then exposing the oxidized fibers to an atmosphere of an inert gas such as nitrogen containing a carbonaceous material such as acetylene. The fibers are preferably treated with an organic compound, for example benzoic acid, before the exposure to an oxidizing atmosphere. The invention also relates to the resulting fibers. The treated fibers have enhanced tensile strength.

REFERENCES:
patent: 3412062 (1968-11-01), Johnson et al.
patent: 3552923 (1971-01-01), Carpenter et al.
patent: 3767773 (1973-10-01), Turner et al.
patent: 4100004 (1978-07-01), Moss et al.
patent: 4295844 (1981-10-01), Warner

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