Results 41 to 50 of about 5,506 (175)

Morphology control of clay-mineral particles as supports for metallocene catalysts in propylene polymerization [PDF]

Polyolefins Journal, 2016
Spray dry granulation of clay minerals was studied to obtain clay mineral base support material for metallocene supported olefin polymerization catalysts.
Takao Tayano, Takehiro Sagae, Takashi Atsumi, Hideshi Uchino, Masahide Murata, Tsutomu Sato   +5 more
doaj   +1 more source

Half-titanocene 5-t-butyl-2-(1-(arylimino)methyl)quinolin-8-olate chlorides: Synthesis, characterization and ethylene (co-) polymerization behavior [PDF]

, 2013
A series of half-titanocene chloride complexes bearing 5-t-butyl-2-(1-(arylimino)methyl)quinolin-8-olate ligands (L), CpTiLCl₂, has been synthesized in acceptable yields by the stoichiometric reaction of CpTiCl₃ with the respective potassium 5-t-butyl-2-(
Chen, Langqiu, Redshaw, Carl, Sun, Wen-Hua, Wang, Lin, Yan, Qing, Yang, Wenhong   +5 more
core   +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

Hybrid materials based on polyethylene and MCM-41 microparticles functionalized with silanes: catalytic aspects of in situ polymerization, crystalline features and mechanical properties [PDF]

, 2016
New nanocomposites based on polyethylene have been prepared by in situ polymerization of ethylene in presence of mesoporous MCM-41. The polymerization reactions were performed using a zirconocene catalyst either under homogenous conditions or supported
A. Bento, Alexander, Alonso-Moreno, Arranz-Andrés, Arranz-Andrés, Arranz-Andrés, Beck, Bento, Boyd, Bunn, Campos, Campos, Cerrada, Cerrada, Cerrada, Cerrada, Cerrada, Cerrada, Cerrada, Cerrada, Chen, Chen, Chenite, Darras, Diez-Pascual, dos Santos, E. Pérez, Finch, Fonseca, Fox, Gedde, Ha, Heijboer, Hiltner, J.P. Lourenço, Jafari, Jentys, Jezequel, Kageyama, Kageyama, Kubacka, Kubacka, Lin, Lourenco, Lu, López-Majada, M.L. Cerrada, M.R. Ribeiro, Marcilla, McCrum, Millot, Oliver, Palza, Palza, Popli, Popli, Prieto, Quinn, Schatzki, Shin, Shirayam, Sindorf, Sinfrônio, V. Lorenzo, Vincent, Ward, Wunderlich, Wunderlich, Ye, Zapata, Zhao   +70 more
core   +1 more source

Gas phase polymerization of ethylene with a silica-supported metallocene catalyst: influence of temperature on deactivation [PDF]

, 1997
Ethylene was polymerized at 5 bar in a stirred powder bed reactor with silica supported rac-Me2Si[Ind]2ZrCl2/methylaluminoxane (MAO) at temperatures between 40°C and 80°C using NaCl as support bed and triethylaluminium (TEA) as a scavenger for impurities.
Meier, G.B., Roos, P., Samson, J.J.C., Samson, Job Jan C., Weickert, G., Westerterp, K.R.   +5 more
core   +2 more sources

Structure-property relations of heterophasic ethylene-propylene copolymers based on a single-site catalyst

eXPRESS Polymer Letters, 2017
The target of the present study was to investigate the structure-property relationships of heterophasic ethylenepropylene (EP) copolymers based on a single-site (metallocene) catalyst (SSC) supported with an emulsion technology developed by Borealis. The
M. Aarnio-Winterhof, P. Doshev, J. Seppala, M. Gahleitner   +3 more
doaj   +1 more source

A new post-metallocene-ti catalyst with maltolate bidentade ligand: an investigation in heterogeneous polymerization reactions in different mesoporous supports [PDF]

, 2016
A new titanium catalyst easily synthesized from ethylmaltol bidentate chelator ligand was studied in homogeneous and heterogeneous ethylene polymerization.
Basso, Nara Regina de Souza, Ferreira, Ana Elisa, Galland, Griselda Barrera, Gheno, Grasiela, Livotto, Paolo Roberto, Lourenço, J. P., Ribeiro, Maria Rosário   +6 more
core   +1 more source

Interplay of reversible chain transfer and comonomer incorporation reactions in coordination copolymerization of ethylene/1–hexene [PDF]

Polyolefins Journal, 2019
Coordinative chain transfer polymerization (CCTP) has opened a new path for the development of novel products like olefin block copolymers and chain-end functional polyolefins.
Ali Ebrahimi, Saeid Ahmadjo, Mohsen Mohammadi, Mohammad-Mahdi Mortazavi, Mostafa Ahmadi   +4 more
doaj   +1 more source

Catalytic Properties of Zirconocene-Based Systems in 1-Hexene Oligomerization and Structure of Metal Hydride Reaction Centers

Molecules, 2023
Despite large-scale investigations of homogeneous single-site metallocene catalysts and systems based on them, there are still unsolved problems related to the control of their activity and chemo- and stereoselectivity.
Lyudmila V. Parfenova, Pavel V. Kovyazin, Almira Kh. Bikmeeva, Eldar R. Palatov, Pavel V. Ivchenko, Ilya E. Nifant’ev, Leonard M. Khalilov   +6 more
doaj   +1 more source

Unveiling the Role of Curvature in Carbon for Improved Energy Release of Ammonium Perchlorate

Advanced Materials, EarlyView.
High‐curvature carbon materials identified via machine learning and simulation can enhance the heat release and combustion performance of ammonium perchlorate. ABSTRACT The catalytic role of carbon curvature in the thermal decomposition of ammonium perchlorate (AP) remains largely unexplored. To address this gap, this study employs machine learning and
Dan Liu, Keliang Song, Haorui Zhang, Zhipeng Liu, Guansong He, Junru Wang, Wenming Yang, Xu Zhao, Zhijian Yang   +8 more
wiley   +1 more source