Dialkylzinc Compounds as Chain Transfer Agents in Ethylene and Propylene Polymerizations Catalyzed by Metallocene Catalysts
Dialkylzinc Compounds as Chain Transfer Agents in Ethylene and Propylene Polymerizations Catalyzed by Metallocene Catalysts
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二烷基锌化合物作为茂金属催化剂催化乙烯和丙烯聚合中的链转移剂
DOI：
10.1080/10601320903539231
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发表时间：
2010-02
影响因子：
2.5
通讯作者：
Zhang, Chuan-Hui
中科院分区：
文献类型：
--
作者：
Dong, Jin-Yong;Zhang, Chuan-Hui
以具有不同空间位阻的烷基的二烷基锌化合物（ZnR 2）为链转移剂，在两种常用茂金属催化剂rac-Et（Ind）2 ZrCl 2和rac-Me 2Si [2-Me-4-Ph-Ind] 2 ZrCl 2催化下进行了乙烯和丙烯聚合。通常，用于乙烯聚合的催化剂活性几乎不受链转移剂的影响，无论R类型如何;然而，当ZnR 2中的R受阻较少时，丙烯聚合中存在显著的活性降低，并且随着R变得更大，催化剂活性逐渐恢复。ZnR 2与茂金属催化剂活性中心形成可逆的非催化活性络合物，ZnR 2的几何构型拥挤降低了络合物的形成倾向，从而降低了络合物对催化剂活性的负面影响。
Dialkylzinc compounds (ZnR2) with the alkyl groups of different steric hindrance were used as chain transfer agents in ethylene and propylene polymerizations catalyzed by two conventional metallocene catalysts including rac-Et(Ind)2ZrCl2 and rac-Me2Si[2-Me-4-Ph-Ind]2ZrCl2. In general, catalyst activities for ethylene polymerizations are barely affected by chain transfer agents, regardless of the R type; however, there are significant activity reductions in propylene polymerizations when the R in ZnR2 is less hindered, and as R becomes bulkier, catalyst activities are gradually restored. ZnR2 and metallocene catalyst active site tend to form a reversible and catalytically inactive complex, thus the geometry congested ZnR2 would reduce complex formation tendency and hence decreased its negative effect on catalyst activities.
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DOI：
10.1002/marc.1990.030110405
发表时间：
1990-04
期刊：
Die Makromolekulare Chemie, Rapid Communications
影响因子：
--
作者：
T. Shiono;Kazuhiro Yoshida;K. Soga
通讯作者：
T. Shiono;Kazuhiro Yoshida;K. Soga
影响因子：
2.5
作者：
S. S. Perin-S.;J. Severn;C. Koning;J. C. Chadwick
通讯作者：
S. S. Perin-S.;J. Severn;C. Koning;J. C. Chadwick
影响因子：
6.6
作者：
M. Mitani;Junji Saito;S. Ishii;Y. Nakayama;H. Makio;Naoto Matsukawa;S. Matsui;Jun-ichi Mohri
通讯作者：
M. Mitani;Junji Saito;S. Ishii;Y. Nakayama;H. Makio;Naoto Matsukawa;S. Matsui;Jun-ichi Mohri
影响因子：
5.4
作者：
A. Behr;Volker A. Brehme
通讯作者：
A. Behr;Volker A. Brehme
影响因子：
1.7
作者：
A. P. Firsov;V. I. Tsvetkova;N. Chirkov
通讯作者：
A. P. Firsov;V. I. Tsvetkova;N. Chirkov