Living copolymerization of ethylene with styrene catalyzed by (cyclopentadienyl)(ketimide)titanium(IV) complex--MAO catalyst system.
Living copolymerization of ethylene with styrene catalyzed by (cyclopentadienyl)(ketimide)titanium(IV) complex--MAO catalyst system.
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DOI：
10.1021/ja052198z
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发表时间：
2005-06
影响因子：
15
通讯作者：
Hao Zhang;K. Nomura
中科院分区：
文献类型：
--
作者：
Hao Zhang;K. Nomura
在甲基铝氧烷（MAO）助催化剂存在下，Cp* TiCl_2（N= CtBu_2）（Cp* = C_5Me_5）催化乙烯与苯乙烯的共聚合以活性方式进行，而乙烯和苯乙烯的均聚均不以活性方式进行。Cp'TiCl_2（X）中的Cp'片段（Cp '）和阴离子给体配体（X）都直接影响共聚行为、催化活性以及苯乙烯的引入，只有上述两组表现出活性共聚。在所得的聚（乙烯-共-苯乙烯）中没有观察到苯乙烯重复单元，这表明一定程度的苯乙烯插入抑制了该催化剂中的链转移。
The copolymerization of ethylene with styrene by Cp*TiCl2(N=CtBu2) (Cp* = C5Me5) took place in a living manner in the presence of methylaluminoxane (MAO) cocatalyst, although the homopolymerization of neither ethylene nor styrene proceeded in a living manner. Both the cyclopentadienyl fragment (Cp') and the anionic donor ligand (X) in Cp'TiCl2(X) directly affect the copolymerization behavior, the catalytic activities, as well as the styrene incorporation; only the above set showed a living copolymerization. No styrene repeating units were observed in the resultant poly(ethylene-co-styrene)s, suggesting that a certain degree of the styrene insertion inhibited the chain transfer in this catalysis.