Results 11 to 20 of about 5,464 (221)

Styrene Polymerization with Group III Metallocenes: A Generative and Interpretable Catalyst Design Strategy Combining Density Functional Theory and Machine Learning

ChemistryEurope
The rational design of group III metallocene catalysts for styrene polymerization remains a complex challenge due to intertwined steric and electronic effects that govern monomer coordination and insertion. A generative and interpretable machine learning
Stella Christodoulou, Etienne Dos Santos, Romuald Poteau, Laurent Maron   +3 more
doaj   +2 more sources

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

Active site nature of magnesium dichloride-supported titanocene catalysts in olefin polymerization [PDF]

Polyolefins Journal, 2015
Heterogeneous Ziegler-Natta and homogeneous metallocene catalysts exhibit greatly different active sitenature in olefin polymerization. In our previous study, it was reported that MgCl2-supported titanocenecatalysts can generate both Ziegler-Natta-type ...
Toshiaki Taniike, Keisuke Goto, Minoru Terano   +2 more
doaj   +1 more source

Polymerization of sterically hindered a-olefins with single-site group 4 metal catalyst precursors [PDF]

Polyolefins Journal, 2016
A variety of group 4 metal catalytic systems (C2-symmetric {EBTHI}-, {SBI}-type zirconocene complexes (C2-1–4); C1-symmetric (C1-5–8) and Cs-symmetric (Cs-9) {Cp/Flu}-type zirconocene complexes; Cp*2ZrCl2 (Cp* 2-10)), half-metallocene complexes (CpTiCl3,
Gabriel Theurkauff, Katty Den Dauw, Olivier Miserque, Aurélien Vantomme, Jean-Michel Brusson, Jean-François Carpentier, Evgeny Kirillov   +6 more
doaj   +1 more source

Chemical and Physical State of Catalysts in the Growth of Single-Walled Carbon Nanotubes inside Metallocene-Filled Single-Walled Carbon Nanotubes

Materials Proceedings, 2023
In this study, the state of catalysts is revealed during the growth of single-walled carbon nanotubes (SWCNTs) inside metallocene-filled SWCNTs. High-resolution transmission electron microscopy and Raman spectroscopy were used to study the kinetics of ...
Marianna V. Kharlamova
doaj   +1 more source

Monomer effect on the chain transfer by diethyl zinc in olefin polymerization by metallocene catalysts [PDF]

Polyolefins Journal, 2021
The present paper systematically studies the homo- and copolymerization of ethylene or propylene using metallocene as catalyst and diethyl zinc as chain transfer agent to obtain the polyolefin waxes with narrow molecular weight distribution and with a ...
Wei Wang, Taoyi Zhang, Liping Hou
doaj   +1 more source

The effect of the amido substituent on polymer molecular weight in propene homopolymerisation by titanium cyclopentadienyl-amide catalysts [PDF]

, 2000
In the homopolymerisation of propene by the cyclopentadienyl-amide titanium catalyst systems [η5,η1-C5H4(CH2)2NR]TiCl2/MAO and [η5,η1-C5H4(CH2)2NR]Ti(CH2Ph)2/B(C6F5)3 (R = tBu, iPr, Me), the catalyst with the smallest substituent (Me) on the amido moiety
Hessen, Bart,, Sinnema, Piet-Jan,, Teuben, Jan H.,   +2 more
core   +1 more source

IN SITU SILICA SUPPORTED METALLOCENE CATALYSTS FOR ETHYLENE POLYMERIZATION [PDF]

Journal of Petroleum Science and Technology, 2014
Bis(2-R-ind)ZrCl2 (R: H or phenyl) was supported on different types of silica by in situ impregnation method and used for ethylene polymerization.
saeid ahmadjo, hassan arabi, Gholam Zohuri, Gholam Nejabat, Mojtaba Omidvar, Mostafa Ahmadi, Mohamad Mortazavi   +6 more
doaj   +1 more source

UHMWPE/SBA-15 nanocomposites synthesized by in situ polymerization [PDF]

, 2016
Different nanocomposites have been attained by in situ polymerization based on ultra-high molecular weight polyethylene (UHMWPE) and mesoporous SBA-15, this silica being used for immobilization of the FI catalyst bis [N-(3-tert-butylsalicylidene)-2,3,4,
Adewole, Amoli, Ana E. Ferreira, Baier, Bakshi, Beck, Beloshenko, Bento, Bryliakov, Campos, Campos, Campos, Carlini, Cerrada, Cerrada, Chen, Cui, Cybo, Dangsheng, Deng, Dong, Dorigato, Díez-Pascual, Ernesto Pérez, Guo, Henri Cramail, Ianuzzi, Ivanchev, Ivanchev, Iwashita, João P. Lourenço, Kaminsky, Katti, Klimova, Kresge, Kurek, Kurtz, M. Rosário Ribeiro, Makio, Makio, Maria L. Cerrada, Mitani, Oliver, Olmos, Panchenko, Park, Quinn, Ribeiro, Sandaroos, Severn, Sinfrônio, Spiegelberg, Sánchez, Talebi, Tjong, Vicente Lorenzo, Wypych, Xu, Zhang, Zhao, Zohuri   +60 more
core   +3 more sources

Intelligent catalysts for ethylene oligomerization and polymerization [PDF]

Polyolefins Journal, 2015
EEthylene polymerization catalysts became available in an enormous variety. The challenge in this research is to find catalysts that are able to connect ethylene molecules in such a way that not only linear chains are produced but variations like ...
Helmut G. Alt
doaj   +1 more source