Results 161 to 170 of about 2,167 (208)

Layer‐lattices in Ziegler–Natta catalysts

Journal of Polymer Science Part B: Polymer Physics, 1988
AbstractSome layered inorganic compounds of interest in old and new polymerization processes by Ziegler‐Natta stereospecific catalysis have been studied. The results are reported of an investigation concerning the crystallographic disorder phenomena in α‐TiCl3, VCl3, FeCl3, ball‐milled α‐MgCl2, β‐MgCl2, and in a new catalytic system produced according ...
ZANNETTI, ROBERTO, MAREGA, CARLA, MARIGO, ANTONIO, A. Martorana   +3 more
openaire   +1 more source

Direct Observation of Radicals in the Activation of Ziegler-Natta Catalysts

Angewandte Chemie - International Edition, 2002
Thomas Risse, Hans-Joachim Freund
exaly   +4 more sources

Metallocene and Ziegler-Natta Catalysts

2021
Fifty years ago, Karl Ziegler and Natta won the Nobel Prize for their discovery of the catalytic polymerization of ethylene and propylene using titanium compounds with aluminum-alkyls as co-catalysts. Polyolefins are constantly growing and are now one of the most important highconsumption polymers. New metallocene/methylaluminoxane (MAO) catalysts have
Vinod Vishwakarma, Sandeep, Kulkarni, S.G.   +1 more
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Demystifying Ziegler–Natta Catalysts: The Origin of Stereoselectivity

ACS Catalysis, 2017
Industrial Ziegler-​Natta catalysts for polypropylene prodn. are complex formulations with a reputation of 'black boxes'. In the present paper, we report the results of an extensive study of the three latest generations with com.
Antonio Vittoria, Nic Friederichs, Vincenzo Busico   +2 more
exaly   +2 more sources

Crystal Structures of Ziegler–Natta Catalyst Supports

Chemistry – A European Journal, 2011
AbstractThe crystal structures of three MgCl2⋅n EtOH complexes with n=1.5, 2.8, and 3.3 have been fully determined. Such complexes are the fundamental precursors for Ziegler–Natta polymerization catalysts used to produce polyolefins on a multimillion‐ton scale worldwide.
Malizia F., Fait A., CRUCIANI, Giuseppe
openaire   +2 more sources

Surface Investigation and Morphological Analysis of Structurally Disordered MgCl2and MgCl2/TiCl4Ziegler–Natta Catalysts [PDF]

ACS Catalysis, 2016
Activated MgCl2 nanocrystals were prepared by controlled dealcoholation of the MgCl2 center dot 6CH(3)OH adduct, mimicking the routinely adopted methods to synthesize industrial heterogeneous Ziegler Natta catalysts.
Maddalena D’Amore, K S Thushara, Alessandro Piovano   +2 more
exaly   +2 more sources

Accelerating the Research Approach to Ziegler–Natta Catalysts

Industrial & Engineering Chemistry Research, 2016
Despite 60 years of history and a stunning success, Ti-based Ziegler–Natta catalysts for the production of isotactic polypropylene remain black-box systems, and progress still relies on trial and error. This represents a limitation in a moment when the most widely used industrial systems, containing phthalates as selective modifiers, need to be ...
BUSICO, VINCENZO, CIPULLO, ROBERTA, Mingione, Alessio, Rongo, Luca   +3 more
openaire   +2 more sources

Structure and Reactivity of Ziegler—Natta Catalyst Intermediates.

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
openaire   +2 more sources

Polymerization of phenylacetylene on Ziegler-Natta catalysts

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1968
1. The kinetics of the polymerization of phenylacetylene on catalysts (α, δ-TiCl3)-(C3H5)3Al in heptane and benzene medium was studied by a dilatometric method. 2. The influence of the concentration of the components of the catalytic system on the rate of polymerization of phenylacetylene was investigated, and the observed constants ...
G. I. Bantsyrev, M. I. Cherkashin, A. A. Berlin   +2 more
openaire   +1 more source

Advances in Ziegler-Natta catalysts for polypropylene

Kinetics and Catalysis, 2006
The most advanced catalysts, based on MgCl2-supported TiCl4 and electron donors, are able to provide polypropylenes with an isotacticity higher than 99%. This, together with the continuous progress made in understanding and exploiting the role of electron donors in controlling polymer MW and MWD, has led to polypropylene products having an ...
A. Ferraro, I. Camurati, T. Dall’Occo, F. Piemontesi, G. Cecchin   +4 more
openaire   +1 more source