Vinyl-Type Polymerization of Norbornene by Nickel(II) bis-Benzimidazole Catalysts

摘要

Novel nickel (II) bis-benzimidazole complexes were prepared. These complexes were synthesized using three steps: condensation, alkylation and complexation. These complexes, upon activation wit MAO, polymerize cyclic olefin norbornene. The polynorbornene synthesized was characterized by GPC, ~(13)C NMR and IR. GPC molecular weights of the polynorbornene polymers were determined using the LS/viscometry/DRI triple detector system and were found to be very high (Mn 148,000 to 288,000 and Mw 587,000 to 797,000). The ~(13)C NMR suggest that the polynorbornene is a vinyl addition product (i.e., 2,3-linked); no ring-opened product was observed.