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Polymerization of styrene using bis(β‐ketoamino)nickel(II)/methylaluminoxane catalytic systems
Author(s) -
Yu Shuxian,
He Xiaohui,
Chen Yiwang,
Liu Yongming,
Hong Sanguo,
Wu Qing
Publication year - 2007
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.26179
Subject(s) - methylaluminoxane , polymerization , polymer chemistry , polystyrene , styrene , molar mass distribution , materials science , coordination polymerization , nickel , chain transfer , monomer , catalysis , polymer , toluene , chain growth polymerization , solution polymerization , copolymer , chemistry , metallocene , radical polymerization , organic chemistry , composite material , metallurgy
Styrene (St) was polymerized in toluene solution by using bis(β‐ketoamino)nickel(II) complex as the catalyst precursor and methylaluminoxane (MAO) as the cocatalyst. The polymerization conditions, such as Al : Ni ratio, monomer concentration, reaction temperature, and polymerization time, were studied in detail. Both of the bis(β‐ketoamino)nickel(II)/MAO catalytic systems exhibited higher activity for polymerization of styrene, and polymerization gave moderate molecular weight of polystyrene with relatively narrow molecular weight distribution ( M w / M n < 1.6). The obtained polymer was confirmed to be atactic polystyrene by analyzing the stereo‐triad distributions mm, mr, and rr of aromatic carbon C 1 in NMR spectrum of the polymer. The mechanism of the polymerization was also discussed and a metal–carbon coordination mechanism was proposed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007
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