CHEN Xiaoli, ZHU Fangming, LIN Shang’an. POLYMERIZATION OF METHYL METHACRYLATE BY NICKEL CATALYST WITH BIS(N,O) LIGANDS IN THE PRESENCE OF MAO COCATALYST[J]. Acta Polymerica Sinica, 2007,(11):1064-1068.
CHEN Xiaoli, ZHU Fangming, LIN Shang’an. POLYMERIZATION OF METHYL METHACRYLATE BY NICKEL CATALYST WITH BIS(N,O) LIGANDS IN THE PRESENCE OF MAO COCATALYST[J]. Acta Polymerica Sinica, 2007,(11):1064-1068.DOI:
Two novel nickel complexes of bis[N-(4-nitrophenyl)salicylaldiminate]nickel(Ⅱ)A and bis[N-(4-methoxyphenyl)salicylaldiminate]nickel(Ⅱ)B weresynthesized.These new type bis(N
O)chelated nickel complexes/MAO catalysts are effective to catalyze polymerization of polar monomer methyl methacrylate(MMA).The A system which contains p-nitro substitution groups on the ligand having electron attractive effect exhibits better activity than B at higher polymerization temperature(50℃).At the polymerization conditions
T_p=30℃;Al/Ni=600
the B system shows the best activity.The chain sequence distribution of PMMA obtained with B systems is 73.2% rr triads as determined by 13C-NMR
and the glass-transition temperature(T_g)is up to 106.4℃ by DSC measurements.