Styrene polymerization by nickel and titanium catalysts based on tris(pyrazolyl)borate ligands

Detalhes bibliográficos
Autor(a) principal: Kuhn,Maria C. A.
Data de Publicação: 2008
Outros Autores: Silva,Jaqueline L. da, Casagrande,Adriana C. A., 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=S0103-50532008000800016
Resumo: Styrene polymerization with a series of nickel and titanium complexes based on sterically hindered tris(pyrazolyl)borate ligands, TpMs = HB(3-mesityl-pyrazolyl)3 and TpMs* = HB(3-mesityl-pyrazolyl)2(5-mesityl-pyrazolyl) have been studied in the presence of MAO cocatalyst under various polymerization conditions. All complexes showed to be active for styrene polymerization producing almost exclusively atactic polystyrene. The catalytic activities as well as the styrene conversions with nickel complexes were higher than those with the titanium analogues. Higher activities were found at 80 ºC. Polystyrene properties are substantially affected by the reaction conditions such as temperature of polymerization, time, and [Al]/[M] molar ratio. The GPC results showed that the molecular weight (Mw) of the polystyrene is sensitive to the temperature of polymerization varying from 16,300 to 138,300 g mol-1.
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spelling Styrene polymerization by nickel and titanium catalysts based on tris(pyrazolyl)borate ligandsnickeltitaniumtris(pyrazolyl)borate ligandpolystyreneStyrene polymerization with a series of nickel and titanium complexes based on sterically hindered tris(pyrazolyl)borate ligands, TpMs = HB(3-mesityl-pyrazolyl)3 and TpMs* = HB(3-mesityl-pyrazolyl)2(5-mesityl-pyrazolyl) have been studied in the presence of MAO cocatalyst under various polymerization conditions. All complexes showed to be active for styrene polymerization producing almost exclusively atactic polystyrene. The catalytic activities as well as the styrene conversions with nickel complexes were higher than those with the titanium analogues. Higher activities were found at 80 ºC. Polystyrene properties are substantially affected by the reaction conditions such as temperature of polymerization, time, and [Al]/[M] molar ratio. The GPC results showed that the molecular weight (Mw) of the polystyrene is sensitive to the temperature of polymerization varying from 16,300 to 138,300 g mol-1.Sociedade Brasileira de Química2008-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532008000800016Journal of the Brazilian Chemical Society v.19 n.8 2008reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532008000800016info:eu-repo/semantics/openAccessKuhn,Maria C. A.Silva,Jaqueline L. daCasagrande,Adriana C. A.Casagrande Jr.,Osvaldo L.eng2008-12-09T00:00:00Zoai:scielo:S0103-50532008000800016Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2008-12-09T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Styrene polymerization by nickel and titanium catalysts based on tris(pyrazolyl)borate ligands
title Styrene polymerization by nickel and titanium catalysts based on tris(pyrazolyl)borate ligands
spellingShingle Styrene polymerization by nickel and titanium catalysts based on tris(pyrazolyl)borate ligands
Kuhn,Maria C. A.
nickel
titanium
tris(pyrazolyl)borate ligand
polystyrene
title_short Styrene polymerization by nickel and titanium catalysts based on tris(pyrazolyl)borate ligands
title_full Styrene polymerization by nickel and titanium catalysts based on tris(pyrazolyl)borate ligands
title_fullStr Styrene polymerization by nickel and titanium catalysts based on tris(pyrazolyl)borate ligands
title_full_unstemmed Styrene polymerization by nickel and titanium catalysts based on tris(pyrazolyl)borate ligands
title_sort Styrene polymerization by nickel and titanium catalysts based on tris(pyrazolyl)borate ligands
author Kuhn,Maria C. A.
author_facet Kuhn,Maria C. A.
Silva,Jaqueline L. da
Casagrande,Adriana C. A.
Casagrande Jr.,Osvaldo L.
author_role author
author2 Silva,Jaqueline L. da
Casagrande,Adriana C. A.
Casagrande Jr.,Osvaldo L.
author2_role author
author
author
dc.contributor.author.fl_str_mv Kuhn,Maria C. A.
Silva,Jaqueline L. da
Casagrande,Adriana C. A.
Casagrande Jr.,Osvaldo L.
dc.subject.por.fl_str_mv nickel
titanium
tris(pyrazolyl)borate ligand
polystyrene
topic nickel
titanium
tris(pyrazolyl)borate ligand
polystyrene
description Styrene polymerization with a series of nickel and titanium complexes based on sterically hindered tris(pyrazolyl)borate ligands, TpMs = HB(3-mesityl-pyrazolyl)3 and TpMs* = HB(3-mesityl-pyrazolyl)2(5-mesityl-pyrazolyl) have been studied in the presence of MAO cocatalyst under various polymerization conditions. All complexes showed to be active for styrene polymerization producing almost exclusively atactic polystyrene. The catalytic activities as well as the styrene conversions with nickel complexes were higher than those with the titanium analogues. Higher activities were found at 80 ºC. Polystyrene properties are substantially affected by the reaction conditions such as temperature of polymerization, time, and [Al]/[M] molar ratio. The GPC results showed that the molecular weight (Mw) of the polystyrene is sensitive to the temperature of polymerization varying from 16,300 to 138,300 g mol-1.
publishDate 2008
dc.date.none.fl_str_mv 2008-01-01
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=S0103-50532008000800016
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532008000800016
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-50532008000800016
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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.19 n.8 2008
reponame:Journal of the Brazilian Chemical Society (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
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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