Study On The Alternative Copolymerization Of Styrene And CO Catalyzed By PdCl₂/M(CF₃SO₃)n/bidentate N-N Ligand

It was first found that PdCl₂ had excellent catalytic effect when applied in the copolymerization of styrene and carbon monoxide as catalytic precursor. Under the prominent co-catalytic effects of some M(CF₃SO₃)_n, the catalytic activity of PdCl₂ amounted to 1.8×104gPK/(molPd.h) in the copolymerization of styrene/CO. The catalytic system of PdCl₂/M(CF₃SO₃)_n/bidentate N-N ligand also had good catalytic effects on the copolymerization of norbenene/CO and dicyclopentadiene/CO. Based on catalytic activity, yield and molecular weights of the copolymers, the effects of active constituents and reaction conditions on the copolymerization of styrene/CO were studied under the catalysis of PdCl₂/M(CF₃SO₃)_n/bidentate N-N ligand. The prominent co-catalytic effects of M(CF₃SO₃)_n and the mechanism of their co-catalysis were especially discussed. The kinetics and catalytic mechanism of the copolymerization of styrene/CO catalyzed by PdCl₂/ M(CF₃SO₃)_n/bidentate N-N ligand were also investigated, combined with some literatures. The structure and properties of STCO were characterized by NMR, FT-IR, EA, GPC, XRD, TGA, DSC and so on, and the spectrums were analyzed and discussed in detail. What's more, the effects of M(CF₃SO₃)_n and ligands on the copolymerization of norbenene/CO and dicyclopentadiene/CO were mainly studied under the catalysis of PdCl₂/M(CF₃SO₃)_n/bidentate N-N ligand, and the same conclusions were drawn as the copolymerization of styrene/CO. The structures of the products synthesized by the copolymerization of norbenene/CO and dicyclopentadiene/CO were characterized by NMR, FT-IR and XRD.