Results 191 to 200 of about 902,813 (269)

Hard versus Soft Materials as Supports for Metallocene and Post‐Metallocene Catalysts

Macromolecular Reaction Engineering, 2009
AbstractThe influence of organic supports on the polymerization behavior of post‐metallocene catalysts is studied and compared with similarly supported titanium and zirconium metallocenes. The effects of the immobilization, activation, and polymerization process were studied by video microscopy, laser confocal fluorescence microscopy, SEM, and TEM.
Naundorf, C., Ferrari, D., Rojas, G., Fink, G., Klapper, M., Müllen, K.   +5 more
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Metallocene Catalysts in Dispersed Media

1997
Metallocene catalysts are organometallic coordination compounds in which one or two cyclopentadienyl rings or substituted cyclopentadienyl rings are bonded to a central transition metal atom, as shown in Figure1. The nature and number of the rings and substituents (S), the type of transition metal (M) and its substituents (R), the type of the bridge ...
J. B. P. Soares, A. E. Hamielec
openaire   +1 more source

New polyolefins by metallocene catalysts

Pure and Applied Chemistry, 1998
Abstract
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Heterogenised MAO-free Metallocene Catalysts

1999
The treatment of dehydroxylated silica with B(C6F5)3 in the presence of dimethylaniline results in borato-modified silica of the approximate composition [HNMe2Ph][(SiO2)50B(C6F5)3] which on addition of metallocene dimethyls in the presence or absence of AlMe3 give catalysts for the polymerisation of ethylene.
Simon J. Lancaster, Sean M. O’Hara, Manfred Bochmann   +2 more
openaire   +1 more source

Olefin Polymerization with Metallocene Catalysts

2014
This chapter firstly explains the basic terms and concepts concerning olefin polymerization and polymer synthesis, and then provides comprehensive yet concise commentaries on olefin polymerization by metallocene catalysts. In Sect. 1.1 (Introduction), the history of olefin polymerization catalysts is briefly reviewed with a focus on the uniformity of ...
openaire   +1 more source

Recent development in heterogeneous metallocene catalysts

Macromolecular Symposia, 1995
AbstractThe synthetic methods of heterogeneous metallocene catalysts reported so far in academic journals are summarized together with their catalyst performance. Some of our new results in this field are also described in brief.
Kazuo Soga, Takashi Arai, Hiroshi Nozawa, Toshiya Uozumi   +3 more
openaire   +1 more source

New Isotactic Polypropylenes via Metallocene Catalysts

1995
Chiral bridged bisindenyl zirconoeenes with special substitution patterns on the aromatic rings are potentially commercial catalysts for the production of isotactic polypropylenes. The performance characteristics of these systems are different, the variations being induced by size and position of the substituents.
W. Spaleck, M. Antberg, M. Aulbach, B. Bachmann, V. Dolle, S. Haftka, F. Küber, J. Rohrmann, A. Winter   +8 more
openaire   +1 more source

Polymerization of alkenes with a post‐metallocene catalyst containing a titanium complex with an oxyquinolinyl ligand

, 2017
L. A. Rishina, Y. Kissin, S. S. Lalayan, S. Gagieva, Vladislav А. Тuskaev, V. Krasheninnikov   +5 more
semanticscholar   +1 more source

A hemi-metallocene chromium catalyst with trimethylaluminum-free methylaluminoxane for the synthesis of disentangled ultra-high molecular weight polyethylene.

Macromolecular rapid communications, 2015
D. Romano, S. Ronca, S. Rastogi
semanticscholar   +1 more source

Synthesis and microstructural study of stereoblock elastomeric polypropylenes from metallocene catalyst (2‐PhInd)2ZrCl2 activated with cocatalyst mixtures

, 2013
Gholam-Reza Nejabat, M. Nekoomanesh, H. Arabi, H. Salehi‐Mobarakeh, G. Zohuri, Mojtaba Omidvar, Stephen A. Miller   +6 more
semanticscholar   +1 more source