Styrene polymerization by nickel and titanium catalysts based on tris(pyrazolyl)borate ligands
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , , |
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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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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1750318169398968320 |