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Vinyl polymerization of norbornene with dinuclear diimine nickel dichloride/MAO
Author(s) -
Mi Xia,
Ma Zhi,
Cui Nannan,
Wang Leyong,
Ke Yucai,
Hu Youliang
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.12149
Subject(s) - methylaluminoxane , norbornene , diimine , polymerization , polymer chemistry , polymer , catalysis , coordination polymerization , glass transition , materials science , chemistry , solution polymerization , metallocene , organic chemistry
Vinyl‐addition polymerization of norbornene was accomplished by two novel dinuclear diimine nickel dichloride complexes in combination with methylaluminoxane (MAO). The activities were moderate. The catalyst structure, Al/Ni molar ratio, solvents, and polymerization temperature all affected the catalytic activities. The obtained polynorbornenes were characterized by 1 H‐NMR, 13 C‐NMR, FTIR, DSC, WAXD, and intrinsic viscosity measurements. The vinyl‐addition polymers were amorphous but with a short‐range order and high packing density. The polynorbornenes showed glass transition temperatures ( T g ) above 240°C and decomposed above 400°C. The catalyst structure and polymerization conditions have effects on the molecular weight and the microstructure of the polymers. The nickel complex with bulkier substituents in the ligand produced polynorbornene with a higher packing density and higher regularity and, therefore, with higher T g . © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 3273–3278, 2003