Results 231 to 240 of about 13,429 (306)

Insight into structural distribution of heterogeneous Ziegler–Natta catalyst from non-empirical structure determination

, 2020
A structural distribution is an intrinsic nature of TiCl4-capped MgCl2 nanoplates, and its comprehension would uncover the origin of distributions in the primary structure of polyolefins produced by Ziegler–Natta catalysts. Such fundamental understanding
Gentoku Takasao, Toru Wada, Ashutosh Thakur, P. Chammingkwan, M. Terano, Toshiaki Taniike   +5 more
semanticscholar   +1 more source

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

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
openaire   +1 more source

Crystallization Behavior of Copolymers of Isotactic Poly(1-butene) with Ethylene from Ziegler–Natta Catalyst: Evidence of the Blocky Molecular Structure

, 2019
The crystallization and thermal properties of copolymers of isotactic poly(1-butene) (iPB) with ethylene (iPBEt) synthesized with a Ziegler–Natta catalyst and ethylene (E) content between 7 and 45 ...
C. De Rosa, O. Ruiz de Ballesteros, F. Auriemma, G. Talarico, Miriam Scoti, R. di Girolamo, Anna Malafronte, F. Piemontesi, Dario Liguori, I. Camurati, G. Morini   +10 more
semanticscholar   +1 more source

Towards the design of a mixture of diether and succinate as an internal donor in a MgCl2-supported Ziegler–Natta catalyst

, 2020
Insight into the impact of mixed internal donors, comprising bis-methoxymethyl-fluorene (BMF) and 2,2-diisopropyl succinate (DIS), on the crystalline structure of MgCl2 supported Ziegler–Natta catalysts is developed.
N. Ghasemi Hamedani, H. Arabi, Fatemeh Poorsank   +2 more
semanticscholar   +1 more source

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

Influence of alkylaluminium on the copolymerization of isoprene and butadiene with supported Ziegler-Natta catalyst

, 2020
The heterogeneous TiCl4/MgCl2 Ziegler-Natta catalysts activated by alkylaluminium (AlR3) yield active centers with complex structures which are sensitive to the structure and concentration of AlR3. Effects of AlR3 on the copolymerizations of isoprene (Ip)
Junying Zhang, Wei Peng, Aihua He
semanticscholar   +1 more source

Effect of alkylaluminium on the regio- and stereoselectivity in copolymerization of isoprene and butadiene using TiCl4/MgCl2 type Ziegler-Natta catalyst

Molecular Catalysis, 2019
Alkylaluminums as one of the most important components of the heterogeneous MgCl2-supported (TiCl4/MgCl2) type Ziegler-Natta catalysts, play significant roles in yielding active species with varied regio- and stereoselectivity.
Q. Niu, Junying Zhang, W. Peng, Zhiqiang Fan, Aihua He   +4 more
semanticscholar   +1 more source

Synthesis of Polar-functionalized Isotactic Polypropylenes Using Commercial Heterogeneous Ziegler-Natta Catalyst.

Journal of the American Chemical Society
The efficient synthesis of polar-functionalized polypropylenes with high molecular weight and high stereoregularity represents a challenging task. This challenge becomes even more daunting when pursuing an industrially preferred heterogeneous process ...
Yu Wang, Quan Wang, Chen Tan, Changle Chen   +3 more
semanticscholar   +1 more source

Ziegler–Natta Catalysts: Regioselectivity and “Hydrogen Response”

ACS Catalysis, 2019
Advanced High Throughput Experimentation (HTE) methods were applied to quantify the regioselectivity and the so-called “hydrogen response” in propene polymerization of four Ziegler–Natta catalysts ...
Vittoria A., Meppelder A., Friederichs N., Busico V., Cipullo R.   +4 more
openaire   +2 more sources