Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol

Detalhes bibliográficos
Autor(a) principal: Justino, Jorge
Data de Publicação: 1995
Outros Autores: Dias, A.R., Tait, J.P.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.15/4530
Resumo: The subject of this work is ethylene polymerisation using Kaminsky type catalysts: Cp2MR2=methylaluminoxane [M=Zr,W,Nb; R=Cl,CH3]. Active center determination and kinetic studies of the (Cp2WCl2 + methylaluminoxane) and Cp2ZrCl2 + methylaluminoxane) systems are described, using a quenching method with tritiated methanol. The activity of the polymer was determined by liquid scintillation counting. We have found 0.5% and 87% of active centers, respectively for W and Zr system. The catalytic activity of complexes Cp2WCl2 and Cp2NbCl2 was compared with that of Cp2ZrCl2. The W and Nb complexes are found to be less active than the Zr complex.
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spelling Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanolZiegler-catalystspolymerizationaluminoxaneThe subject of this work is ethylene polymerisation using Kaminsky type catalysts: Cp2MR2=methylaluminoxane [M=Zr,W,Nb; R=Cl,CH3]. Active center determination and kinetic studies of the (Cp2WCl2 + methylaluminoxane) and Cp2ZrCl2 + methylaluminoxane) systems are described, using a quenching method with tritiated methanol. The activity of the polymer was determined by liquid scintillation counting. We have found 0.5% and 87% of active centers, respectively for W and Zr system. The catalytic activity of complexes Cp2WCl2 and Cp2NbCl2 was compared with that of Cp2ZrCl2. The W and Nb complexes are found to be less active than the Zr complex.Elsevier ScienceRepositório Científico do Instituto Politécnico de SantarémJustino, JorgeDias, A.R.Tait, J.P.2023-09-08T15:20:27Z1995-091995-09-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.15/4530engJustino, J.A.; Dias, A.R. & Tait, J.P. (1995) Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol. Journal of Radioanalytical and Nuclear Chemistry, Articles, 195(2), 355–362. https://doi.org/10.1007/BF020359760236-5731https://doi.org/10.1007/BF02035976info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-21T07:38:08Zoai:repositorio.ipsantarem.pt:10400.15/4530Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:56:07.736942Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol
title Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol
spellingShingle Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol
Justino, Jorge
Ziegler-catalysts
polymerization
aluminoxane
title_short Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol
title_full Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol
title_fullStr Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol
title_full_unstemmed Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol
title_sort Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol
author Justino, Jorge
author_facet Justino, Jorge
Dias, A.R.
Tait, J.P.
author_role author
author2 Dias, A.R.
Tait, J.P.
author2_role author
author
dc.contributor.none.fl_str_mv Repositório Científico do Instituto Politécnico de Santarém
dc.contributor.author.fl_str_mv Justino, Jorge
Dias, A.R.
Tait, J.P.
dc.subject.por.fl_str_mv Ziegler-catalysts
polymerization
aluminoxane
topic Ziegler-catalysts
polymerization
aluminoxane
description The subject of this work is ethylene polymerisation using Kaminsky type catalysts: Cp2MR2=methylaluminoxane [M=Zr,W,Nb; R=Cl,CH3]. Active center determination and kinetic studies of the (Cp2WCl2 + methylaluminoxane) and Cp2ZrCl2 + methylaluminoxane) systems are described, using a quenching method with tritiated methanol. The activity of the polymer was determined by liquid scintillation counting. We have found 0.5% and 87% of active centers, respectively for W and Zr system. The catalytic activity of complexes Cp2WCl2 and Cp2NbCl2 was compared with that of Cp2ZrCl2. The W and Nb complexes are found to be less active than the Zr complex.
publishDate 1995
dc.date.none.fl_str_mv 1995-09
1995-09-01T00:00:00Z
2023-09-08T15:20:27Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.15/4530
url http://hdl.handle.net/10400.15/4530
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Justino, J.A.; Dias, A.R. & Tait, J.P. (1995) Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol. Journal of Radioanalytical and Nuclear Chemistry, Articles, 195(2), 355–362. https://doi.org/10.1007/BF02035976
0236-5731
https://doi.org/10.1007/BF02035976
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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