A kind of highly organsoluble polyimide and copolyimides were successfully synthesized from bicyclo(2.2.2)-oct-7-ene-2,3,5,6-tetracarboxylic dianhydride (BCDA),
The dissolution experiments of chalcopyrite in 2 mol/L NaCI solutions at 70℃ show that the dissolution rate of chalcopyrite oscillates non-periodically with r