Dual catalyst system composed by nickel and vanadium complexes containing nitrogen ligands for ethylene polymerization
Autor(a) principal: | |
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Data de Publicação: | 2005 |
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=S0103-50532005000700024 |
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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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 |
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.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) |
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 |
_version_ |
1750318166627581952 |