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Synthesis of Polyimides and Segmented Block Copolyimides by Transimidization - Published online 20 September 2000 The transimidization reaction has been successfully utilized to prepare a series of segmented block copolyimides from an AX-type amino imide monomer containing the tetrahydro(5)helicene unit. The AX-type amino imide monomer is stable during isolation and purification owing to its inert X (e.g., N-pyridyl) group, but readily underwent a self-transimidization reaction to produce a polyimide or a series of block copolyimides by reaction with commercially available dianhydrides and diamines./
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