Effect of AlEt3and an External Donor on the Distribution of Active Sites According to Their Stereospecificity in Propylene Polymerization over TiCl4/MgCl2Catalysts with Different Titanium Content

2016 ◽  
Vol 217 (12) ◽  
pp. 1384-1395 ◽  
Author(s):  
Marina Nikolaeva ◽  
Tatiana Mikenas ◽  
Mikhail Matsko ◽  
Vladimir Zakharov
Keyword(s):  
Active Sites ◽  
Titanium Content ◽  
Propylene Polymerization ◽  
External Donor

scholarly journals Silyl diol ester as a new selectivity control agent in MgCl2-supported Ziegler–Natta systems for propylene polymerization: catalyst structure and polymer properties

RSC Advances ◽  
2019 ◽  
Vol 9 (13) ◽  
pp. 7420-7431 ◽  
Author(s):  
Fatemeh Poorsank ◽  
Hassan Arabi ◽  
Nona Ghasemi Hamedani
Keyword(s):  
Control Agent ◽  
Propylene Polymerization ◽  
External Donor ◽  
Catalyst Structure ◽  
Internal Donor ◽  
Polymerization Catalyst ◽  
Polymer Properties ◽  
Selectivity Control ◽  
Diol Ester

In this study, bis(benzoyloxy)dimethylsilane (SDE) was developed as a non-phthalate selectivity control agent (internal donor (ID) and external donor (ED)) in MgCl2-supported Ziegler–Natta (ZN) systems for polypropylene polymerization.

POISONING OF ACTIVE SITES ON ZIEGLER-NATTA CATALYST FOR PROPYLENE POLYMERIZATION

2008 ◽  
Vol 26 (05) ◽  
pp. 547 ◽  
Author(s):  
Kitti Tangjituabun ◽  
Sang Yull Kim ◽  
Yuichi Hiraoka ◽  
Toshiaki Taniike ◽  
Minoru Terano ◽  
...  
Keyword(s):  
Active Sites ◽  
Propylene Polymerization ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Formation of isolated titanium(III) ions in superactive titanium–magnesium catalysts with a low titanium content as active sites in ethylene polymerization

2014 ◽  
Vol 48 ◽  
pp. 38-40 ◽  
Author(s):  
Evgeny I. Koshevoy ◽  
Tatiana B. Mikenas ◽  
Vladimir A. Zakharov ◽  
Alexander M. Volodin ◽  
Roman M. Kenzhin
Keyword(s):  
Ethylene Polymerization ◽  
Active Sites ◽  
Titanium Content

scholarly journals Development of Large-Scale Stopped-Flow Technique and its Application in Elucidation of Initial Ziegler–Natta Olefin Polymerization Kinetics

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1012 ◽  
Author(s):  
Ashutosh Thakur ◽  
Toru Wada ◽  
Patchanee Chammingkwan ◽  
Minoru Terano ◽  
Toshiaki Taniike
Keyword(s):  
Active Sites ◽  
Large Scale ◽  
Olefin Polymerization ◽  
Polymerization Kinetics ◽  
Propylene Polymerization ◽  
Time Range ◽  
Stopped Flow ◽  
Chemical Transformations ◽  
Polymerization Catalysis ◽  
Short Period

The stopped-flow (SF) technique has been extensively applied to study Ziegler–Natta (ZN) olefin polymerization kinetics within an extremely short period (typically <0.2 s) for understanding the nature of the active sites as well as the polymerization mechanisms through microstructure analyses of obtained polymers. In spite of its great applicability, a small amount of polymer that is yielded in a short-time polymerization has been a major bottleneck for polymer characterizations. In order to overcome this limitation, a large-scale SF (LSF) system has been developed, which offers stable and scalable polymerization over an expanded time range from a few tens milliseconds to several seconds. The scalability of the LSF technique has been further improved by introducing a new quenching protocol. With these advantages, the LSF technique has been effectively applied to address several unknown issues in ZN catalysis, such as the role of physical and chemical transformations of a catalyst on the initial polymerization kinetics, and regiochemistry of ZN propylene polymerization. Here, we review the development of the LSF technique and recent efforts for understanding heterogeneous ZN olefin polymerization catalysis with this new system.

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