Preparation of carbon fibres

摘要

A process for the production of carbon fibres is described in which a precursor fibre which is a copolymer of acrylonitrile, a chlorinated monomer, and itaconic acid containing between 2 to 20 molar parts of chlorinated comoner, between 0.5 and 5 molar parts of itaconic acid and 0 to 5 molar parts of other comonomers per 100 molar parts of acrylonitrile to a temperature in the range 200 DEG -400 DEG C while the natural shrinkage of the fibre is at least restrained followed by further heat treatment at a temperature in the range 800 DEG -3000 DEG C in a non-oxidizing atmosphere.