Dual catalyst system composed by nickel and vanadium complexes containing nitrogen ligands for ethylene polymerization

Detalhes bibliográficos
Autor(a) principal: Furlan,Luciano G.
Data de Publicação: 2005
Outros Autores: Casagrande Jr.,Osvaldo L.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Journal of the Brazilian Chemical Society (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532005000700024
Resumo: Branched polyethylene/high-density polyethylene blends (BPE/HDPE) were prepared using the combined [NiCl2(alpha-diimine)] (1) (alpha-diimine = 1,4-bis(2,6-diisopropylphenyl)-acenaphthenediimine) and [TpMs*VCl2(NtBu)] (2) (TpMs* = hydridobis(3-mesitylpyrazol-1-yl)(5-mesitylpyrazol-1-yl)) catalysts. The polymerization reactions were performed in hexane or toluene at three different polymerization temperatures (0, 30 and 50 °C) and several nickel molar fractions (xNi), using MAO as cocatalyst. At all temperatures, the activities show an approximate linear correlation with xNi, indicating a non-synergistic effect between the nickel and the vanadium species. Higher activities were found in toluene at 0 °C. The melting temperatures for the polyethylene blends produced at 0 °C decrease as xNi increases in the medium indicating good miscibility between the polyethylene phases made by both catalysts. The surface morphology of the BPE/HDPE blends studied by scanning electron microscopy (SEM) revealed low miscibility between the PE phases mainly in the case of the polymer blends produced at high temperature (50 ºC).
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spelling Dual catalyst system composed by nickel and vanadium complexes containing nitrogen ligands for ethylene polymerizationBPE/HDPE blendsethylene polymerizationhomogeneous binary catalyst systemNickel and Vanadium catalystsBranched polyethylene/high-density polyethylene blends (BPE/HDPE) were prepared using the combined [NiCl2(alpha-diimine)] (1) (alpha-diimine = 1,4-bis(2,6-diisopropylphenyl)-acenaphthenediimine) and [TpMs*VCl2(NtBu)] (2) (TpMs* = hydridobis(3-mesitylpyrazol-1-yl)(5-mesitylpyrazol-1-yl)) catalysts. The polymerization reactions were performed in hexane or toluene at three different polymerization temperatures (0, 30 and 50 °C) and several nickel molar fractions (xNi), using MAO as cocatalyst. At all temperatures, the activities show an approximate linear correlation with xNi, indicating a non-synergistic effect between the nickel and the vanadium species. Higher activities were found in toluene at 0 °C. The melting temperatures for the polyethylene blends produced at 0 °C decrease as xNi increases in the medium indicating good miscibility between the polyethylene phases made by both catalysts. The surface morphology of the BPE/HDPE blends studied by scanning electron microscopy (SEM) revealed low miscibility between the PE phases mainly in the case of the polymer blends produced at high temperature (50 ºC).Sociedade Brasileira de Química2005-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532005000700024Journal of the Brazilian Chemical Society v.16 n.6a 2005reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532005000700024info:eu-repo/semantics/openAccessFurlan,Luciano G.Casagrande Jr.,Osvaldo L.eng2006-01-04T00:00:00Zoai:scielo:S0103-50532005000700024Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2006-01-04T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Dual catalyst system composed by nickel and vanadium complexes containing nitrogen ligands for ethylene polymerization
title Dual catalyst system composed by nickel and vanadium complexes containing nitrogen ligands for ethylene polymerization
spellingShingle Dual catalyst system composed by nickel and vanadium complexes containing nitrogen ligands for ethylene polymerization
Furlan,Luciano G.
BPE/HDPE blends
ethylene polymerization
homogeneous binary catalyst system
Nickel and Vanadium catalysts
title_short Dual catalyst system composed by nickel and vanadium complexes containing nitrogen ligands for ethylene polymerization
title_full Dual catalyst system composed by nickel and vanadium complexes containing nitrogen ligands for ethylene polymerization
title_fullStr Dual catalyst system composed by nickel and vanadium complexes containing nitrogen ligands for ethylene polymerization
title_full_unstemmed Dual catalyst system composed by nickel and vanadium complexes containing nitrogen ligands for ethylene polymerization
title_sort Dual catalyst system composed by nickel and vanadium complexes containing nitrogen ligands for ethylene polymerization
author Furlan,Luciano G.
author_facet Furlan,Luciano G.
Casagrande Jr.,Osvaldo L.
author_role author
author2 Casagrande Jr.,Osvaldo L.
author2_role author
dc.contributor.author.fl_str_mv Furlan,Luciano G.
Casagrande Jr.,Osvaldo L.
dc.subject.por.fl_str_mv BPE/HDPE blends
ethylene polymerization
homogeneous binary catalyst system
Nickel and Vanadium catalysts
topic BPE/HDPE blends
ethylene polymerization
homogeneous binary catalyst system
Nickel and Vanadium catalysts
description Branched polyethylene/high-density polyethylene blends (BPE/HDPE) were prepared using the combined [NiCl2(alpha-diimine)] (1) (alpha-diimine = 1,4-bis(2,6-diisopropylphenyl)-acenaphthenediimine) and [TpMs*VCl2(NtBu)] (2) (TpMs* = hydridobis(3-mesitylpyrazol-1-yl)(5-mesitylpyrazol-1-yl)) catalysts. The polymerization reactions were performed in hexane or toluene at three different polymerization temperatures (0, 30 and 50 °C) and several nickel molar fractions (xNi), using MAO as cocatalyst. At all temperatures, the activities show an approximate linear correlation with xNi, indicating a non-synergistic effect between the nickel and the vanadium species. Higher activities were found in toluene at 0 °C. The melting temperatures for the polyethylene blends produced at 0 °C decrease as xNi increases in the medium indicating good miscibility between the polyethylene phases made by both catalysts. The surface morphology of the BPE/HDPE blends studied by scanning electron microscopy (SEM) revealed low miscibility between the PE phases mainly in the case of the polymer blends produced at high temperature (50 ºC).
publishDate 2005
dc.date.none.fl_str_mv 2005-12-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532005000700024
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532005000700024
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-50532005000700024
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Journal of the Brazilian Chemical Society v.16 n.6a 2005
reponame:Journal of the Brazilian Chemical Society (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
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reponame_str Journal of the Brazilian Chemical Society (Online)
collection Journal of the Brazilian Chemical Society (Online)
repository.name.fl_str_mv Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv ||office@jbcs.sbq.org.br
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