Results 21 to 30 of about 20,042 (215)

Comparison of Ethylene/1-Hexene Copolymers Microstructures Synthesized by Homogeneous and Heterogeneous Metallocene Catalysts [PDF]

علوم و تکنولوژی پلیمر, 2013
The substituted (bis-2-PhIndZrCl2) and non-substituted (bis-IndZrCl2) indenylbased metallocene catalysts were synthesized and used in homogenous and heterogeneous forms for copolymerization of ethylene and 1-hexene.
Saeid Ahmadjo
doaj   +1 more source

Tetramethylcyclopentadienyl Samarium(II) Metallocene Chemistry: Isolation of a Bimetallic Sm(II)/Sm(II) Complex

Inorganics, 2022
The salt metathesis reaction between one equivalent of SmI2(THF)2 and two equivalents of K(C5Me4H) in THF afforded single crystals of the unusual, toluene-soluble, and asymmetric bimetallic Sm(II)/Sm(II) complex, (C5Me4H)2SmII(μ-η3:η5-C5Me4H)SmII(C5Me4H)(
Joseph Q. Nguyen, Joseph W. Ziller, William J. Evans   +2 more
doaj   +1 more source

Study of Ziegler-Natta/(2-PhInd)2ZrCl2 hybrid catalysts performance in slurry propylene polymerization [PDF]

Polyolefins Journal, 2015
Several types of hybrid catalysts are made through mixing of 4th generation Ziegler-Natta (ZN) and (2-PhInd)2ZrCl2  metallocene catalysts using triethylaluminum (TEA) as coupling agent.
Gholam-Reza Nejabat, Mehdi Nekoomanesh, Hassan Arabi, Hamid Salehi-Mobarakeh, Gholam-Hossein Zohuri, Mohammad-Mahdi Mortazavi, Saeid Ahmadjo, Stephen Miller   +7 more
doaj   +1 more source

Chemical Properties of Metallocene-Filled Carbon Nanotubes to Tailor Toxicity in Plants

Biology and Life Sciences Forum, 2023
Metallocenes are toxic chemicals that are used for the growth of carbon nanotubes (CNTs). The study of the toxicity of metallocenes on plants is very important. It governs the issues of genetics.
Marianna V. Kharlamova
doaj   +1 more source

Effect of a Metallocene Catalyst Mixture on CNT Yield Using the FC-CVD Process

Catalysts, 2022
This work studies synthesis of carbon nanotube (CNT) sheet using the high temperature (1400 °C) floating catalyst chemical vapor deposition (FC-CVD) method.
Devika Chauhan, Anuptha Pujari, Guangqi Zhang, K. Dasgupta, V. Shanov, M. Schulz   +5 more
semanticscholar   +1 more source

The Metallocene Battery: Ultrafast Electron Transfer Self Exchange Rate Accompanied by a Harmonic Height Breathing

Angewandte Chemie, 2021
The first all‐metallocene rechargeable battery consisting of poly‐cobaltocenium/‐ and poly‐ferrocene/reduced graphene oxide composites as anode and cathode was prepared.
S. M. Beladi-Mousavi, S. Sadaf, Ann‐Kristin Hennecke, Jonas Klein, A. Mahmood, Christian Rüttiger, M. Gallei, Fang Fu, É. Fouquet, J. Ruiz, D. Astruc, L. Walder   +11 more
semanticscholar   +1 more source

Use of foliar fertilizers on soybeans in the Republic of Tatarstan

BIO Web of Conferences, 2020
In 2018, studies were conducted to assess the impact of foliar feeding with complex fertilizers on the yield and grain quality of two soybean varieties.
Kolesar Valeria, Sharipova Gulsia, Safina Diana, Safin Radik   +3 more
doaj   +1 more source

Metallocene-Naphthalimide Derivatives: The Effect of Geometry, DFT Methodology, and Transition Metals on Absorption Spectra

Molecules, 2023
In the present paper, the photophysical properties of metallocene-4-amino-1,8-naphthalimide-piperazine molecules (1-M2+), as well as their oxidized and protonated derivatives (1−M3+, 1-M2+-H+, and 1-M3+-H+), where M = Fe, Co, and Ni, were studied via DFT
Christina Eleftheria Tzeliou, Demeter Tzeli   +1 more
doaj   +1 more source

Structure–Reactivity Relationships in Methylaluminoxane: Ionization Potentials Across Compositions and Morphologies [PDF]

Chemphyschem
Structure–reactivity relationships in methylaluminoxane (MAO) are quantified via RI‐MP2 ionization potential calculations. Ionization potentials become more negative with increasing oligomer size, and sheets are more reactive than cages. At experimentally relevant sizes, the superior reactivity of the ovalene‐type 16,7 sheet at its C‐type site explains
Mao X, Hu W, Collins S, Linnolahti M.
europepmc   +2 more sources

Comparison of Support Effects on Phillips and Metallocene Catalysts

Catalysts, 2021
Both metallocene and Phillips chromium catalysts are used in the commercial manufacture of polyethylene. Unlike most other commercial metallocene systems, the Chevron Phillips Chemical (CPC) platform does not use methylaluminoxane or fluoroorganic ...
Qing Yang, M. P. McDaniel
semanticscholar   +1 more source