Synthesis and properties of branched polyethylene/high-density polyethylene blends using a homogeneous binary catalyst system composed of early and late transition metal complexes
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , , |
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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Repositório Institucional da UNESP |
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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 |
|
_version_ |
1808129078587293696 |