| 摘要 |
Polyetherketoneimides and copolymers thereof having an imide repeat unit of formula <IMG> wherein Ri is <IMG> or <IMG> in which A is a direct bond or -O- or another substantially non-electron-withdrawing group, and/or Ra is an at least partly arylene moiety other than m- or p-phenylene. These polymers tend to have improved melt stability and other properties, especially when made from a pre-existing imide monomer, instead of by the known amic acid route which results in uncyclised amic acid residues in the polymer.
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