Synthesis and properties of branched polyethylene/high-density polyethylene blends using a homogeneous binary catalyst system composed of early and late transition metal complexes

Detalhes bibliográficos
Autor(a) principal: Kunrath, Fábio A. [UNESP]
Data de Publicação: 2002
Outros Autores: Mauler, Raquel S., De Souza, Roberto F., Casagrande Jr., Osvaldo L.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1002/1521-3935(200210)203:14<2058
http://hdl.handle.net/11449/219278
Resumo: Branched polyethylene/high-density polyethylene blends (BPE/HDPE) with a wide range of molecular weights, melt flow indexes (MFI), and intrinsic viscosity were prepared using the homogeneous binary catalyst system composed by Ni(α-diimine)Cl2 (1) (α-diimine = 1,4-bis(2,6- diisopropylphenyl)-acenaphthenednmme) and {TpMs*}TiCl3 (2) (TpMs* = hydridobis(3-mesitylpyrazol-1-yl)(5-mesitylpyrazol-1-yl)) activated with MAO and/or TIBA in hexane at two different polymerization temperatures (30 and 55 °C) and by varying the nickel loading molar fraction (xNi). At all temperatures, a non-linear correlation between the xNi and the productivity was observed, suggesting the occurrence of a synergistic effect between the nickel and the titanium catalyst precursors, which is more pronounced at 55 °C. The molecular weight of the BPE/HDPE blends considerably decreases with increasing A1/M molar ratio. The melt flow indexes (MFI) and intrinsic viscosities (η) are strongly affected by xNi, but the melting temperatures are nearly constant. 132 ± 3 °C. Dynamic mechanical thermal analysis (DMTA) shows the formation of different polymeric materials where the stiffness varies according to the xNi and temperature used in the polymerization reaction. The surface morphology of the BPE/HDPE blends studied by scanning electron microscopy (SEM) revealed a low miscibility between the PE phases resulting in the formation of a sandwich structure after etching with o-xylene.
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spelling Synthesis and properties of branched polyethylene/high-density polyethylene blends using a homogeneous binary catalyst system composed of early and late transition metal complexesBPE/HDPE blendsEthylene polymerizationHomogeneous binary catalyst systemSynergistic effectTi and Ni catalystsBranched polyethylene/high-density polyethylene blends (BPE/HDPE) with a wide range of molecular weights, melt flow indexes (MFI), and intrinsic viscosity were prepared using the homogeneous binary catalyst system composed by Ni(α-diimine)Cl2 (1) (α-diimine = 1,4-bis(2,6- diisopropylphenyl)-acenaphthenednmme) and {TpMs*}TiCl3 (2) (TpMs* = hydridobis(3-mesitylpyrazol-1-yl)(5-mesitylpyrazol-1-yl)) activated with MAO and/or TIBA in hexane at two different polymerization temperatures (30 and 55 °C) and by varying the nickel loading molar fraction (xNi). At all temperatures, a non-linear correlation between the xNi and the productivity was observed, suggesting the occurrence of a synergistic effect between the nickel and the titanium catalyst precursors, which is more pronounced at 55 °C. The molecular weight of the BPE/HDPE blends considerably decreases with increasing A1/M molar ratio. The melt flow indexes (MFI) and intrinsic viscosities (η) are strongly affected by xNi, but the melting temperatures are nearly constant. 132 ± 3 °C. Dynamic mechanical thermal analysis (DMTA) shows the formation of different polymeric materials where the stiffness varies according to the xNi and temperature used in the polymerization reaction. The surface morphology of the BPE/HDPE blends studied by scanning electron microscopy (SEM) revealed a low miscibility between the PE phases resulting in the formation of a sandwich structure after etching with o-xylene.Instituto de Química de Araraquara UNESP, C. P. 355, Araraquara, SP, 14800-900Laboratory of Molecular Catalysis Instituto de Química UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre, RS, 91509-900Instituto de Química de Araraquara UNESP, C. P. 355, Araraquara, SP, 14800-900Universidade Estadual Paulista (UNESP)UFRGSKunrath, Fábio A. [UNESP]Mauler, Raquel S.De Souza, Roberto F.Casagrande Jr., Osvaldo L.2022-04-28T18:54:39Z2022-04-28T18:54:39Z2002-10-18info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article2058-2068http://dx.doi.org/10.1002/1521-3935(200210)203:14<2058Macromolecular Chemistry and Physics, v. 203, n. 14, p. 2058-2068, 2002.1022-1352http://hdl.handle.net/11449/21927810.1002/1521-3935(200210)203:14<20582-s2.0-0037131643Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMacromolecular Chemistry and Physicsinfo:eu-repo/semantics/openAccess2022-04-28T18:54:39Zoai:repositorio.unesp.br:11449/219278Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T19:30:27.319252Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Synthesis and properties of branched polyethylene/high-density polyethylene blends using a homogeneous binary catalyst system composed of early and late transition metal complexes
title Synthesis and properties of branched polyethylene/high-density polyethylene blends using a homogeneous binary catalyst system composed of early and late transition metal complexes
spellingShingle Synthesis and properties of branched polyethylene/high-density polyethylene blends using a homogeneous binary catalyst system composed of early and late transition metal complexes
Kunrath, Fábio A. [UNESP]
BPE/HDPE blends
Ethylene polymerization
Homogeneous binary catalyst system
Synergistic effect
Ti and Ni catalysts
title_short Synthesis and properties of branched polyethylene/high-density polyethylene blends using a homogeneous binary catalyst system composed of early and late transition metal complexes
title_full Synthesis and properties of branched polyethylene/high-density polyethylene blends using a homogeneous binary catalyst system composed of early and late transition metal complexes
title_fullStr Synthesis and properties of branched polyethylene/high-density polyethylene blends using a homogeneous binary catalyst system composed of early and late transition metal complexes
title_full_unstemmed Synthesis and properties of branched polyethylene/high-density polyethylene blends using a homogeneous binary catalyst system composed of early and late transition metal complexes
title_sort Synthesis and properties of branched polyethylene/high-density polyethylene blends using a homogeneous binary catalyst system composed of early and late transition metal complexes
author Kunrath, Fábio A. [UNESP]
author_facet Kunrath, Fábio A. [UNESP]
Mauler, Raquel S.
De Souza, Roberto F.
Casagrande Jr., Osvaldo L.
author_role author
author2 Mauler, Raquel S.
De Souza, Roberto F.
Casagrande Jr., Osvaldo L.
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (UNESP)
UFRGS
dc.contributor.author.fl_str_mv Kunrath, Fábio A. [UNESP]
Mauler, Raquel S.
De Souza, Roberto F.
Casagrande Jr., Osvaldo L.
dc.subject.por.fl_str_mv BPE/HDPE blends
Ethylene polymerization
Homogeneous binary catalyst system
Synergistic effect
Ti and Ni catalysts
topic BPE/HDPE blends
Ethylene polymerization
Homogeneous binary catalyst system
Synergistic effect
Ti and Ni catalysts
description Branched polyethylene/high-density polyethylene blends (BPE/HDPE) with a wide range of molecular weights, melt flow indexes (MFI), and intrinsic viscosity were prepared using the homogeneous binary catalyst system composed by Ni(α-diimine)Cl2 (1) (α-diimine = 1,4-bis(2,6- diisopropylphenyl)-acenaphthenednmme) and {TpMs*}TiCl3 (2) (TpMs* = hydridobis(3-mesitylpyrazol-1-yl)(5-mesitylpyrazol-1-yl)) activated with MAO and/or TIBA in hexane at two different polymerization temperatures (30 and 55 °C) and by varying the nickel loading molar fraction (xNi). At all temperatures, a non-linear correlation between the xNi and the productivity was observed, suggesting the occurrence of a synergistic effect between the nickel and the titanium catalyst precursors, which is more pronounced at 55 °C. The molecular weight of the BPE/HDPE blends considerably decreases with increasing A1/M molar ratio. The melt flow indexes (MFI) and intrinsic viscosities (η) are strongly affected by xNi, but the melting temperatures are nearly constant. 132 ± 3 °C. Dynamic mechanical thermal analysis (DMTA) shows the formation of different polymeric materials where the stiffness varies according to the xNi and temperature used in the polymerization reaction. The surface morphology of the BPE/HDPE blends studied by scanning electron microscopy (SEM) revealed a low miscibility between the PE phases resulting in the formation of a sandwich structure after etching with o-xylene.
publishDate 2002
dc.date.none.fl_str_mv 2002-10-18
2022-04-28T18:54:39Z
2022-04-28T18:54:39Z
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://dx.doi.org/10.1002/1521-3935(200210)203:14<2058
Macromolecular Chemistry and Physics, v. 203, n. 14, p. 2058-2068, 2002.
1022-1352
http://hdl.handle.net/11449/219278
10.1002/1521-3935(200210)203:14<2058
2-s2.0-0037131643
url http://dx.doi.org/10.1002/1521-3935(200210)203:14<2058
http://hdl.handle.net/11449/219278
identifier_str_mv Macromolecular Chemistry and Physics, v. 203, n. 14, p. 2058-2068, 2002.
1022-1352
10.1002/1521-3935(200210)203:14<2058
2-s2.0-0037131643
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Macromolecular Chemistry and Physics
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 2058-2068
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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