KARBIDFASERN MIT HOHER FESTIGKEIT UND HOHEM ELASTIZITÄTSMODULUS UND POLYMERZUSAMMENSETZUNG DAFÜR.

摘要

A polymer composition of (a) a organosilicon polymer contg. units of formula (-SiR1R2-) (where R1 and R2 are H, lower alkyl, phenyl or -SiH3) linked by methylene groups, and opt. also (-SiR1R3-) units (where R3 is -M or -OM; M is Ti, Zr, or Hf); (b) anistropic polycyclic aromatic compounds (pitch) as mesophase or premesophase; and (c) isotropic polycyclic aromatic compounds. Also claimed is high-strength carbon fibre obtained by spinning and carbonising the polymer composition. This fibre contains (i) crystalline carbon orientated on the fibre axis; (ii) non-crystalline carbon and/or crystalline carbon not oriented on the fibre axis; (iii) silicon-contg. material having Si, C, O, in the proportion (wt.) Si 30-70%; C 20-60%; 00.5-10%. If a metal is present in (iii) the proportions are Si 5-70%; C 20-40%; 0 0.01-30% and metal (Ti, Zr or Hf) 0.5-45%. (iii) pref. consists of crystalline SiC and non-crystalline SiOx (where x=0-2), the SiC having grain size below 500 Angstroms and opt. MOz (where M is Ti, Zr, or Hf; z is 0-2), and MCy (where y is 0-1).