Results 101 to 110 of about 1,886 (220)

Surface model for gas-phase polymerizations of ethylene and propylene using supported metallocene/methylalumoxane catalysts

, 2002
In order to obtain more detailed information about supported metallocene/methylaluminoxane catalysts, 2 catalysts are supported onto a flat silicon wafer by spin-coating impregnation.
Piet J. Lemstra, Lemstra, P.J., Kaminsky, W, Weingarten, U, J.W. (Hans) Niemantsverdriet, Weingarten, U., Peter C. Thüne, Walter Kaminsky, Thüne, P.C., Fabian Müller, Müller, F., Muller, F, Niemantsverdriet, J.W., Loos, J, Niemantsverdriet, JW, Kaminsky, W., Joachim Loos, Lemstra, PJ, Ulrich Weingarten, Thune, PC, Loos, J.   +20 more
core   +1 more source

Two-State Models for Propylene Polymerization Using Metallocene Catalysts. 2. Application to ansa-Metallocene Catalyst Systems

, 2016
A kinetic model to describe the propylene polymerization behavior of ansa-metallocene catalysts was derived. The model can predict n-ad stereosequence distributions, polymer crystallinity, and related properties as well as distinguish between extremes in
J. C. Pinto (2982273), Muqtar Mohammed (2988459), Marcos L. Dias (3057507), Marcio Nele (2166625), Shixuan Xin (2988456), Scott Collins (696953)   +5 more
core   +1 more source

Group (IV) Metallocene Complexes with Bulky ω-aryloxyalkyl-Substituted Indenyl Ligands as Catalyst Precursors for Homogeneous Ethylene Polymerization [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2018
A series of seven new complexes of zirconium and hafnium with bulky ω-aryloxyalkyl substituted indenyl ligands were synthesized and characterized by NMR spectroscopy and elemental analysis. These complexes were activated with methylaluminoxane and tested
Khalil Ahmad, Helmut Guido Alt
doaj  

28. Molecular Weight Distribution Control with Supported Metallocene Catalysts

, 1994
Several kinds of supported Cp(2)MeCl(2) (Me = Ti, Zr, Ht) catalysts were prepared with three different SiO2-supports; i.e., SiO2/MAO, SiO2/Al(C2H5)(3) and SiO2/(C2H5)MgCl.
Ihm, Son-Ki, Kyung-Jun Chu, YIM, Jin Heong, CHU, Kyung Jun, Jin-Heong Yim, Son-Ki Ihm   +5 more
core   +1 more source

Impact of geometric properties of silica supports on metallocene catalyst behavior

, 2018
The objective of this work was to evaluate the effect of the physical properties of several different commercial silicas on the performance of metallocene catalysts when used in gas and slurry phase polymerization.
Rezende Lara, Barbara, McKenna, Timothy, Bashir, M. Ahsan   +2 more
core  

Study of the effect of branching in degradation of polyethylenes obtained via metallocene catalyst [PDF]

, 2008
Polyethylenes, homo and copolymers obtained via metallocene catalyst, were synthesized and used to study the effect of comonomer size and content in the main linear backbone polymer on its degradation.
Quijada Abarca, Juan, Escudero Acevedo, Mario, Campos Vallette, Marcelo   +2 more
core  

Magnesium chloride supported bis(cyclopentadienyl)titanium(IV) dichloride-MAO catalyst for ethylene polymerization

, 1997
A novel magnesium chloride supported titanocene catalyst was synthesized using a soluble tetrahydrofuran complex of magnesium chloride. The suported catalyst polymerized ethylene with high activities in presence of methylaluminoxane.
Sivaram, Swaminathan, Sen Sarma, Soumen
core   +1 more source

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   +1 more source

Integrated synthesis of metallocene@support catalysts based on glyphosate and its zirconium derivatives

, 2017
Three new kinds of composite metallocene catalyst, Cp2Zr@Gly, Cp2Zr@ZrGp and Cp2Zr@EXZrGP, were synthesized and their catalytic activity in ethylene polymerization was studied.
Qinghong Xu, Yasai Shi, Yuejuan Zhang, Annan Zhou   +3 more
core   +1 more source

Dimethyl-​silyl-​bridged-​1-​substituted-​2-​indenyl metallocene complexes for olefin polymerization, polymerization of olefins and to polymers

, 2018
The metallocene complex is dimethylsilylene-​bridged-​1-​substituted-​2-​indenyl ligand of Ti, Zr or Hf. The metallocene complex catalyst is for prepg. polyolefins, a process for polymg. olefins and to polymers prepd.
Voskoboynikov, Alexander, Coen, Hendriksen, Mladentsev, Dmitry Y., Borisov, Ilya, Cipullo, Roberta, Guzeev, Bogdan A., Busico, Vincenzo, Uborsky, Dmitry, Friederichs, Nicolaas Hendrika, Vittoria, Antonio, Sharikov, Mikhail I.   +10 more
core