Results 71 to 80 of about 902,813 (269)

Metallocene Catalysts for 1‐Butene Polymerization [PDF]

Macromolecular Chemistry and Physics, 2006
AbstractSummary: Isotactic polybutenes of variable isotacticity and melting points of form I in the range 100–125 °C have been prepared with both C2‐ and C1‐symmetric zirconocenes. The C1‐symmetric zirconocenes bearing the bilateral symmetric 2,5‐dimethyl‐7H‐cyclopenta[1,2‐b:4,3‐b′]dithiophene ligand connected by a dimethylsilandiyl bridge to a ...
Luigi Resconi, Isabella Camurati, Federica Malizia   +2 more
openaire   +1 more source

Advanced Macromolecular Architectures via Inorganic Polymers

Macromolecular Rapid Communications, Volume 47, Issue 2, 23 January 2026.
From linear chains to advanced macromolecular architectures, this review explores how innovations in inorganic polymers unlock new structural and functional capabilities. Emphasizing modern synthetic strategies and unique architectural designs, it highlights the emerging potential of main‐group element systems as next‐generation alternatives to ...
Edip Ajvazi, Pauline Stadler, Paul Strasser, Ian Teasdale   +3 more
wiley   +1 more source

Catalytic N_2-to-NH_3 Conversion by Fe at Lower Driving Force: A Proposed Role for Metallocene-Mediated PCET [PDF]

, 2017
We have recently reported on several Fe catalysts for N_2-to-NH_3 conversion that operate at low temperature (−78 °C) and atmospheric pressure while relying on a very strong reductant (KC_8) and acid ([H(OEt_2)_2][BArF_4]). Here we show that our original
Chalkley, Matthew J., Del Castillo, Trevor J., Matson, Benjamin D., Peters, Jonas C., Roddy, Joseph P.   +4 more
core   +1 more source

Fragmentable Heterogeneous Cocatalysts for the Metallocene-Catalyzed Polymerization of Olefins, II [1]. Preparation, Characterization and Testing of the Cocatalysts and Microscopic Evaluation of the Polyethylene [PDF]

, 2005
Surface modified silica were reacted with different aluminiumalkyls AlR2R’ (R = Me, Et, i-Bu, R’ = H, Me, Et, i-Bu), oligomeric methylaluminoxane (MAO) and combinations of both, to yield heterogeneous cocatalysts.
Lange, Katharina C. H., Schumann, Herbert, Wassermann, Birgit C., Widmaier, Ralf   +3 more
core   +1 more source

CVD‐Engineered Ni and FeNi Catalysts on Hexagonal Boron Nitride for Efficient CO2‐Methane Co‐Conversion to Syngas: High‐Performance Alternatives to Traditional Alumina‐Supported Catalysts

International Journal of Energy Research, Volume 2026, Issue 1, 2026.
This study presents a sustainable approach for mitigating greenhouse gas emissions by converting methane (CH4) and carbon dioxide (CO2) into syngas using nickel‐based catalysts supported on hexagonal boron nitride (hBN), synthesized through chemical vapor deposition (CVD).
Benyamin M. Garmejani, Samira Mehravar, Shohreh Fatemi, Juan M. Coronado   +3 more
wiley   +1 more source

Growth of Nanotubes inside eDIPS Carbon Nanotubes

Proceedings
The growth of carbon nanotubes is a very important process [...]
Marianna V. Kharlamova
doaj   +1 more source

Estudo da preparação do catalisador Cp2ZrCl2 suportado em sílica utilizando um planejamento de experimentos Preparation conditions of Cp2ZrCl2 supported on silica using an experimental planning

Polímeros, 2001
O monômero eteno foi polimerizado através dos sistemas catalíticos Cp2ZrCl2/SiO2 e Cp2ZrCl2/MAO/SiO2. Foi elaborado um planejamento estatístico de experimentos a fim de se identificar as melhores condições de preparo dos catalisadores heterogêneos.
Anunciata Conte, Maria de Fátima V. Marques   +1 more
doaj   +1 more source

Correlation Between Vinyl Content of Recycled HDPE and Polymer Degradation: An NMR Approach

Journal of Applied Polymer Science, Volume 142, Issue 47, December 15, 2025.
The degradation behavior of high‐density polyethylene (HDPE) during recycling depends on its vinyl group content. This study shows that 1H NMR spectroscopy enables accurate assessment of vinyl groups unlike FTIR. Changes in melt flow and molecular weight with multiple processing are linked to vinyl content which could enable tailor‐made re‐additivation
Kim Hao Ng, Frank Malz, Elke Metzsch‐Zilligen, Rudolf Pfaendner   +3 more
wiley   +1 more source

Synthesis of Early Transition Metal Bisphenolate Complexes and Their Use as Olefin Polymerization Catalysts [PDF]

, 2009
Bisphenolate ligands with pyridine- and benzene-diyl linkers have been synthesized and metalated with group 4 and 5 transition metals. The solid-state structures of some of the group 4 complexes have been solved.
Bercaw, John E., Golisz, Suzanne R.
core   +1 more source

Early (Ti, Zr)-late (Rh, Ir) heteronuclear complexes with bridging sulphido ligands [PDF]

, 2016
[EN]: We report in this account on the controlled synthesis of novel d0-d8 early-late heteropolynuclear diolefin and carbonyl clusters. The synthetic approach was based on additive-deprotonation reactions involving the titanium and zirconium bis ...
Casado, Miguel A., Ciriano, Miguel A., Hernandez-Gruel, Marc A. F., Oro, Luis A., Pérez-Torrente, Jesús J.   +4 more
core   +1 more source