Results 61 to 70 of about 360,310 (205)

Pressure‐Decay Kinetic Modeling of Homogeneous Ethylene Polymerization with Et(Ind)2ZrCl2/TIBA‐Borate Catalyst System in a Batch Reactor

Polymer Engineering &Science, Volume 66, Issue 11, Page 8151-8163, November 2026.
A kinetic model comprising both propagation and deactivation functions was developed for metallocene‐catalyzed ethylene polymerization in a batch reactor. The model predicted polymer yields very close to the experimental ones. The polymer molecular weight increased with ethylene pressure and decreased with temperature.
Narendra Singh Choudhary, Sanjib K. Patra, Narayan C. Pradhan   +2 more
wiley   +1 more source

Six-coordinated half-metallocene catalyst for ethylene polymerization and its mechanism study

Giant
The demand for catalysts capable of enabling olefin polymerization at elevated temperatures to meet industrial requirements continues to grow. Among emerging candidates, novel six-coordinated half-metallocene catalysts, which combine the advantages of ...
Qian Li, Zifang Guo, Shuzhang Qu, Xinwei Li, Jian Chen, Yiming Wei, Cui Zheng, Zhihui Song, Yue Lan, Zhao Wen, Chaofan Yu   +10 more
doaj   +1 more source

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

ChemPhysChem, Volume 27, Issue 20, 28 October 2026.
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
Xiaotong Mao, Wei Hu, Scott Collins, Mikko Linnolahti   +3 more
wiley   +1 more source

Synthesis, Updated Characterization, and Reactivity of Low‐Valent Titanocene Complexes

European Journal of Inorganic Chemistry, Volume 29, Issue 30, 27 October 2026.
Syntheses and characterizations are provided for a series of low‐valent titanocene complexes including halotitanocene(III) dimers, [Cp2Ti(κ2‐DME)][BAr4] cations, and heterobimetallic [Cp2Ti(μ‐Cl)2AlR2]. Additionally, a monomeric titanacyclopropene complex featuring a pendent phosphine was prepared, and C─F bond activation upon reduction of [Cp{η5:κ2F2 ...
Griffin J. LaChapelle, James F. Britten, David J. H. Emslie   +2 more
wiley   +1 more source

Kinetic and mechanistic aspects of metallocene polymerisation catalysts

, 2004
The nature of the counteranion is an essential component of metallocene polymerisation catalysts. Detailed mechanistic investigations show how the anion is able to determine the activity and, in many cases, also the stereoselectivity of the catalyst ...
Bochmann, Manfred
core   +1 more source

Research progress and applications of novel perfluoroaryl borate in polymerization

e-Polymers
Metallocene catalysts, renowned for their exceptional activity, have drawn widespread attention in academia and industry for polymerization. Additionally, cocatalysts are pivotal in metallocene systems, significantly influencing both catalytic activity ...
Wei Yiming, Qu Shuzhang, Li Xinwei, Chen Jian, Zheng Cui, Li Qian, Lan Yue   +6 more
doaj   +1 more source

Polyisoprene-based block copolymers as supports for metallocene and post-metallocene catalytic systems toward ethylene polymerization

, 2011
In this work, we report how micellar structures obtained by the self-assembly in heptane of polyisoprene-block-poly(methyl methacrylate) (PI-b-PMMA) and polyisoprene-block-poly(ethylene oxide) (PI-b-PEO) can be effectively used as organic supports for ...
HEURTEFEU, Bertrand, ORIOU, Jules, IBARBOURE, Emmanuel, Jules Oriou, CRAMAIL, Henri, Henri Cramail, CLOUTET, Eric, Bertrand Heurtefeu, Éric Cloutet, Emmanuel Ibarboure   +9 more
core   +1 more source

Polymer-supported metallocene catalysts for ethylene polymerisation: Characterisation and catalytic studies

, 2007
A series of polymer-supported unbridged metallocene dichloride catalysts, Cp″CpMCl2 (where Cp″ = C5Me4H and M = Ti or Zr) have been prepared. These catalysts have been characterised in detail and have shown promising activity in ethylene polymerisation ...
Jenny, C., de Miguel, Y. R., Pochan, D., Shearer, A. S., Minich, E. A.   +4 more
core   +1 more source

Observation of Different Catalytic Activity of Various 1-Olefins during Ethylene/1-Olefin Copolymerization with Homogeneous Metallocene Catalysts

Molecules, 2011
This research aimed to investigate the copolymerization of ethylene and various 1-olefins. The comonomer lengths were varied from 1-hexene (1-C6) up to 1-octadecene (1-C18) in order to study the effect of comonomer chain length on the activity and ...
Mingkwan Wannaborworn, Bunjerd Jongsomjit, Piyasan Praserthdam   +2 more
doaj   +1 more source

Isotactic-b-Syndiotactic Stereoblock Poly(methyl methacrylate) by Chiral Metallocene/Lewis Acid Hybrid Catalysts

, 2016
Stereoblock polymerization with chiral ansa-metallocene/strong Lewis acid hybrid catalysts capable of switching stereospecificity of the methyl methacrylate polymerization produces the highly stereoregular isotactic-b-syndiotactic stereoblock poly(methyl
Eugene Y.-X. Chen (1270119), Andrew D. Bolig (2465893)   +1 more
core   +1 more source