Results 31 to 40 of about 360,310 (205)

A Brief Review of the Cocatalysts Types and their Performance in (Co)Polymerization Processes of Olefins: From Synthesis to Industrial Application [PDF]

Baspārish, 2022
In the past, most researchers believed that cocatalyst is a passive component that only has the task of "removing impurities" and "alkylating" the active centers of catalyst at the beginning of the polymerization and does not play a specific role in the ...
maryam masoori, Reza Rashedi, Abdolhannan Sepahi, Mohammad Hossein Jandaghian, Ehsan Nikzinat, Saeed Houshmand moayed   +5 more
doaj   +1 more source

Introdução de catalisadores metalocênicos como estratégia competitiva da indústria de termoplásticos The introduction of metallocene catalysts as a competitive strategy of the thermoplastic industry

Polímeros, 1997
Recentes inovações tecnológicas no setor de polímeros levaram a novos catalisadores que poderão mudar a estrutura de toda a indústria. É feita uma análise das estratégias competitivas adotadas pelas empresas do setor e do impacto que a adoção dos ...
Francisco A. Ribeiro Fº, Maria José S. Ferreira Netto, Carlos A. Hemais   +2 more
doaj   +1 more source

Testing DFT ability to predict the stereoselectivity of group 4 metallocenes in propylene polymerization [PDF]

Polyolefins Journal, 2014
In this study we have tested the ability of a standard DFT computational protocol to reproduce the experimentally obtained stereoselectivity of 26 different C2-symmetric zirconocene catalysts active in propylene polymerization.
Naeimeh bahri-Laleh, Laura Falivene, Luigi Cavallo   +2 more
doaj   +1 more source

Highly Active Half-Metallocene Chromium(III) Catalysts for Ethylene Polymerization Activated by Trialkylaluminum

, 2016
Highly active half-metallocene type chromium(III) catalysts for ethylene polymerization have been developed. High molecular weight linear polyethylene (Mn > 1 000 000 g/mol) was produced by these catalysts in the presence of a relatively small amount of ...
Yanchun Tao (2502553), Wei Gao (2085), Tieqi Xu (1446679), Jianguo Ni (2502550), Ling Ye (111749), Ying Mu (1505536)   +5 more
core   +4 more sources

Catalisadores metalocênicos suportados para a produção de poliolefinas: revisão das estratégias de imobilização

Química Nova, 2011
The inadequacy of strategies used for the heterogeneization of metallocene catalysts is pointed out as one of the main causes of the lack of industrial employability of such polymerization catalysts.
Adriano G. Fisch, Nilo S. M. Cardozo, Argimiro R. Secchi, João H. Z. dos Santos   +3 more
doaj   +1 more source

Modification of ethylene-norbornene copolymer by Gamma irradiation [PDF]

Hemijska Industrija, 2006
The possibility of modifying polyethylene and many other polymers with high energy radiation has led to many useful applications. Due to their new combination of properties and the shortage of experimental data, the radiolysis of a new class of materials,
Kačarević-Popović Zorica M., Šećerov Bojana, Marinović-Cincović Milena T., Nedić Zoran, Jovanović Slobodan M.   +4 more
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

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

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

Metallocene catalysts for the polymerization and copolymerization of Alpha-olefins : a research collaboration project report

, 2001
Results obtained during the tenure of a BMBF-supported collaborative research project, comprising the parts "Exploration of new ansa-metallocene complexes", "Commercially applicable metallocene syntheses", "Metallocene catalysts on solid supports" and ...
Schweier, Günther, Brintzinger, Hans-Herbert   +1 more
core   +1 more source