Results 91 to 100 of about 13,429 (306)

Propylene–Ethylene Copolymer Covalent Adaptable Networks Synthesized by Resonance‐Stabilized, Radical‐Based Reactive Processing with Excellent Elevated‐Temperature Creep Resistance

open access: yesChemSusChem, Volume 18, Issue 20, October 23, 2025.
Propylene‐ethylene copolymer covalent adaptable networks (PEC CANs) are synthesized via one‐step, radical‐based reactive processing with the use of initiator, dynamic cross‐linkers, and vinyl aromatic additives. The best CAN suppresses over 98% of creep at 100 °C (semicrystalline state) for 10,000 s compared to neat PEC.
Yen‐Wen Huang   +6 more
wiley   +1 more source

Influência do envelhecimento de catalisadores Ziegler-Natta à base de neodímio sobre a polimerização de 1,3-butadieno Influence of ageing of neodymium based Ziegler-Natta catalyst on butadiene polymerization

open access: yesPolímeros, 2007
Catalisadores envelhecidos em diferentes tempos (0, 5, 15, 40, 80 e 160 dias) e diferentes temperaturas (10, 25 e 40 °C) foram testados na polimerização 1,4-cis do 1,3-butadieno.
Ivana L. Mello   +3 more
doaj   +1 more source

Tha synthesis of syndiotactic polystyrene using monocyclopentadienyl titanium complexes [PDF]

open access: yes, 2008
Série čtyř nových halosilylsubstituovaných monocyklopentadienylových komplexů titanu [Si(CH3)2FCp]TiCl3 – FSiTTC, [Si(CH3)F2Cp]TiCl3 F2SiTTC, [Si(CH3)Cl2Cp]TiCl3 - Cl2SiTTC, [Si(CH3)2ClCp]TiCl3 - ClSiTTC byla po aktivaci methylalumoxanem testována jako ...
Svačina, Zdeněk
core  

Water-accelerated organic transformations [PDF]

open access: yes, 2001
Rather than quenching all reactive intermediates and arresting the reaction, the addition of catalytic or stoichiometric (1-10 equiv.) quantities of H2O to organic and organometallic processes can lead to surprisingly beneficial effects on reaction rate,
Ribe, S, Wipf, P
core   +2 more sources

A Practical Guide to Heterogeneous Catalysis in Hydrocarbon Transformations

open access: yesChemistry – An Asian Journal, Volume 20, Issue 20, October 17, 2025.
A focused overview of the catalytic processing of hydrocarbons to transform them into more valuable compounds is presented. This work is intended to assist BSc, MSc, and PhD students, as well as junior researchers, in selecting and performing appropriate heterogeneous catalytic processes for specific heterogeneous catalytic reactions.
Kelvin A. Sanoja‐Lopez   +5 more
wiley   +1 more source

Principais aspectos da polimerização do 1,3-butadieno Principles aspects of butadiene 1,3 polymerization

open access: yesPolímeros, 2005
Atualmente, há uma grande demanda pelo polibutadieno com alto teor de unidades 1,4-cis, devido às suas excelentes propriedades físicas, tais como alta resistência à abrasão, baixo desenvolvimento de calor, baixa resistência ao rolamento, maior ...
Denise S. S. Nunes   +2 more
doaj   +1 more source

Geometry and local environment of surface sites in Vanadium-based Ziegler-Natta catalysts from 51V solid-state NMR Spectroscopy [PDF]

open access: green, 2023
Sebastian Sabisch   +4 more
openalex   +1 more source

Polimerização 1,4 - cis de butadieno com o sistema catalítico tetracloreto de titânio/triisobutilalumínio/iodo 1,4 cis-Polymerization of butadiene by the catalyst system titanium tetrachloride/triisobutylaluminium/iodine

open access: yesPolímeros, 2000
Foi utilizado o sistema catalítico tipo Ziegler-Natta modificado, constituído por TiCl4/I2/Al(i-Bu)3 para a síntese de polibutadieno com alto teor de unidades 1,4-cis.
Neusa M. T. Pires   +2 more
doaj   +1 more source

Technology Strategies in the Knowldge Economy. The Licensing Activity of Himont [PDF]

open access: yes
The exchange of technologies and technological knowledge - through joint-ventures, partnerships, licensing, cross-licensing, R&D contracts - and the upsurge of markets for technology are main features of the "knowledge-based" economy.
Fabrizio Cesaroni
core  

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