| 摘要 |
PREPARATION OF AROMATIC POLYKETONES Polyaryletherketones are synthesised by Friedel Crafts chemistry using a catalytic quantity of a strong acid (e.g. trifluoromethanesulphonic acid) in a solvent of lower acidity preferably comprising a second acid of strength at least equal to chloroacetic acid. Suitable second acids can be recovered for reuse, and only a small (catalytic) amount of the expensive strong acid is required. |
