| 摘要 |
Carbon fibre is produce by (1) using acrylonitrile polymer (PAN) consisting of 85 mole % acrylonitrile and 15 mole % vinyl comonomer; (2) adding 0.0002 - 5.5 mole % (w.r.t. metal content) of transition metal of period 4, its halide, oxide, inorganic salt, e.g. sulphate and nitrate, organic salt, e.g. acetate, or metal complex, as pyrolysis catalyst, before or after spinning and drawing polymer to fibrous material; (3) subjecting this material to oxidn. treatment in oxidising atmos. in one or more stages, with stretching or shrinkage to prevent disorder fo mol. chain along fibre direction; and (4) carbonising and graphitising oxidised material in non-oxidising atmos. Prod. can be used as reinforcement for composities. High productivity of high quality C fibre is attained, with reduced pre-oxidn. and carbonisation times. Prod. has high strength and stiffness, uniform fibrous structure and narrow tensile strength distribution. |
