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Copolymerization of 5-norbornene-2-metheneoxy-trimethylsilyl [NB-CH 2 OSi(CH 3 ) 3 ] with norbornene (NB) or methyl 5-norbornene-2-carboxylate (NB-COOCH 3 ) was carried out in toluene by using novel nickel(II) complex catalyst systems, Ni(benzocyclohexan-ketonaphthylimino) 2 /B(C 6 F 5 ) 3  [Ni(bchkni) 2 /B(C 6 F 5 ) 3 ]. The catalyst system showed high activity on the copolymerization of NB-CH 2 OSi(CH 3 ) 3  with NB (2.3–3.3×10 4  g polymer /mol Ni ·h) and NB-CH 2 OSi(CH 3 ) 3  with NB-COOCH 3 (0.5–3.0×10 4  g polymer /mol Ni ·h). However, the solubility of copolymers of NB-CH 2 OSi(CH 3 ) 3  with NB and NB-CH 2 OSi(CH 3 ) 3  with NB-COOCH 3 , which contain 18.7–86.7 mol% of NB-CH 2 OSi(CH 3 ) 3 , was too poor to characterize. The achieved copolymers were confirmed to be vinyl-addition copolymers through the analysis of FTIR,  1 H NMR, and  13 C NMR spectra. The incorporation rate was 8.7–86.7 mol% at a content of 10–90 mol% of the NB-CH 2 OSi(CH 3 ) 3  in the monomer feeds ratios. The obtained ester functionalized NB copolymer containing 8.7–18.7 mol% of NB-CH 2 OSi(CH 3 ) 3  showed a moderate molecular weight (M w =1.6–6.0×10 4  g/mol) and relative narrow molecular weight distribution (M w /M n =1.6–2.2). Thermogravimetry (TGA) analyses results showed that the copolymers exhibited good thermal stability (T d =330–350°C) and were noncrystalline by WAXD analyses results.

journal of polymer engineering

Copolymerization of 5-norbornene-2-metheneoxy-trimethylsilyl with methyl 5-norbornene-2-carboxylate catalyzed by a novel Ni(benzocyclohexan-ketonaphthylimino) 2 /B(C 6 F 5 ) 3 ) system