Molar mass control by diethyl zinc in the polymerization of butadiene initiated by the ternary catalyst system neodymium versatate/diisobutylaluminum hydride/ethylaluminum sesquichloride

被引：25
|
作者：
Friebe, L
Müller, J
Nuyken, O
Obrecht, W
机构：
[1] Tech Univ Munich, Lehrstuhl Makromol Stoffe, D-85747 Garching, Germany
[2] Univ Toronto, Dept Chem, Toronto, ON, Canada
[3] Lanxess Deutschland GmbH, LXS TRP APD, Business Unit, Dormagen, Germany
来源：
JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY | 2006年 / A43卷 / 01期
关键词：
diene polymerization; living polymerization; molar mass control; neodymium; rubber; Ziegler-Natta-catalysis; zinc alkyls;
D O I：
10.1080/10601320500405786
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The polymerization of 1,3-butadiene (BD) catalyzed by the ternary Ziegler/Natta catalyst system neodymium versatate (NdV)/diisobutylaluminum hydride (DIBAH)/ethylaluminum sesquichloride (EASC) is investigated in regard to molar mass control by diethyl zinc (ZnEt2 ). Within the investigated range of ratios of ZnEt2 to NdV, the features of a living polymerization with a reversible exchange of the living polybutadienyl chains between neodymium and zinc are observed. In summary, ZnEt2 can be considered as an efficient molar mass control agent, which has a negligible impact on polymerization rates. In addition to the reduction of molar masses, ZnEt2 also reduces the polydispersity (PDI) and leads to a decrease of the cis-1,4-content.
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页码：11 / 22
页数：12
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