Addition polymerization of norbornene using bis(β-ketoamino)nickel(II)/tris(pentafluorophenyl)borane catalytic systems

Synthesis and characterization of α-diamine palladium complexes and insight into hybridization effects of nitrogen donor atoms on norbornene (co)polymerizations

Hybridization effects of nitrogen donor atoms showed that the α-diamine palladium catalyst more easily produced highly active Pd²⁺cations for norbornene (co)polymerization.

Synthesis of bis-(benzocyclohexan-ketoimino) Ni(ii) with different electron groups and their catalytic copolymerization of norbornene and polar norbornene

Several N,O-chelating type bidentate ligand nickel complexes were synthesized, characterized and applied to catalyze copolymerization of norbornene and polar norbornene.

Norbornene homopolymerization and copolymerization with ethylene by phosphine-sulfonate nickel catalysts

Phosphine-sulfonate nickel catalyzed norbornene homopolymerization and copolymerization with ethylene with an interesting response to B(C₆F₅)₃ additive.

Well-defined phosphino-phenolate neutral nickel(ii) catalysts for efficient (co)polymerization of norbornene and ethylene

With B(C₆F₅)₃as a singular cocatalyst, a series of phosphino-phenolate neutral nickel catalysts were found to be highly efficient for norbornene (co)polymerization. High molecular weight (co)polymers with good solubility in common organic solvents were obtained.

Synthesis of well defined C–C bridged Ni(ii) complexes bearing β-ketoiminato-fluorene ligands by bifluorenyl in situ coupling and application for norbornene (co)polymerization

9-Substituted fluorene C–C bridged constrained geometry configuration (CGC) Ni(ii) complexes Ni1 and Ni2 were synthesized by coordination reaction and in situ coupling reaction in the presence of (DME)NiBr₂.

Silica-supported Ni(II) complex bearing [O^N] ligand and copolymerization to afford silica hybrid polynorbornenes nanocomposites

In situ polymerization is an ideal technique to make a perfect dispersion of nanosilica into polymer matrixes. So, in this article, a novel silica-supported β-ketoamine nickel(II) dibromide precatalyst was efficiently prepared and used in in situ slurry polymerizations of norbornene (NB) to afford a highly productive NB addition polymerization system in combination with tris(pentafluorophenyl)borane (B(C6F5)3) cocatalyst. It exhibited productivity of 176.8 kg of polynorbornene (mol Ni)−1 h−1 at a mole ratio of B/Ni = 20, and the catalyst deactivation kinetics in the early stage of polymerization fitted well by the first-order deactivation kinetics up to about 60 min. The catalyst system was also effective for the copolymerization of NB and 5-norbornene-2-carboxylic acid methyl ester to produce the addition-type copolymers with high-molecular-weights (3.28–3.45 × 105 g mol−1) and incorporation rates (8.1–49.1%) as well as narrow molecular weight distributions (polydispersity index = 1.6). The nanoparticles were confirmed to be well-dispersed in the polymer matrix with each individual nanoparticle surrounded by polymer. Transparency of nanocomposites could be kept up to about 60%. The brittleness of polymer was obviously improved, and the tensile strength of polymer film could be as high as 47.8 MPa.