The influence of long chain branches of LLDPE on processability and physical properties

Detalhes bibliográficos
Autor(a) principal: Dartora,Paula Cristina
Data de Publicação: 2015
Outros Autores: Santana,Ruth Marlene Campomanes, Moreira,Ana Cristina Fontes
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Polímeros (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282015000600531
Resumo: Two polyethylene-based on single-site metallocene catalyst (mLLDPE) were selected to characterize the effect of long chain branching (LCB) on blown film processability, optical and mechanical properties. 13C NMR and parallel plate rheology were used to identify LCB presence on LLDPEs. Blown films were produced from 100% LLDPEs using three different machine direction (MD) stretch ratios. When the same processing conditions for the two LLDPEs grades were used, better processability was observed for LLDPE with LCB. In relation to mechanical and physical properties, Elmendorf tear and optical properties were highly influenced by the presence of LCB. Tear resistance is affected by film orientation and is inversely proportional to the level of LCB in the polymer. It was observed a reduction of 50% in the MD tear strength when comparing with the polymer without LCB. However, haze decreases significantly with the presence of LCB, about 40%.
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spelling The influence of long chain branches of LLDPE on processability and physical propertiesLLDPEmetallocenelong chain branchingNMRrheologymechanical propertiesTwo polyethylene-based on single-site metallocene catalyst (mLLDPE) were selected to characterize the effect of long chain branching (LCB) on blown film processability, optical and mechanical properties. 13C NMR and parallel plate rheology were used to identify LCB presence on LLDPEs. Blown films were produced from 100% LLDPEs using three different machine direction (MD) stretch ratios. When the same processing conditions for the two LLDPEs grades were used, better processability was observed for LLDPE with LCB. In relation to mechanical and physical properties, Elmendorf tear and optical properties were highly influenced by the presence of LCB. Tear resistance is affected by film orientation and is inversely proportional to the level of LCB in the polymer. It was observed a reduction of 50% in the MD tear strength when comparing with the polymer without LCB. However, haze decreases significantly with the presence of LCB, about 40%.Associação Brasileira de Polímeros2015-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282015000600531Polímeros v.25 n.6 2015reponame:Polímeros (São Carlos. Online)instname:Associação Brasileira de Polímeros (ABPol)instacron:ABPO10.1590/0104-1428.1732info:eu-repo/semantics/openAccessDartora,Paula CristinaSantana,Ruth Marlene CampomanesMoreira,Ana Cristina Fonteseng2015-12-21T00:00:00Zoai:scielo:S0104-14282015000600531Revistahttp://www.scielo.br/pohttps://old.scielo.br/oai/scielo-oai.php||revista@abpol.org.br1678-51690104-1428opendoar:2015-12-21T00:00Polímeros (São Carlos. Online) - Associação Brasileira de Polímeros (ABPol)false
dc.title.none.fl_str_mv The influence of long chain branches of LLDPE on processability and physical properties
title The influence of long chain branches of LLDPE on processability and physical properties
spellingShingle The influence of long chain branches of LLDPE on processability and physical properties
Dartora,Paula Cristina
LLDPE
metallocene
long chain branching
NMR
rheology
mechanical properties
title_short The influence of long chain branches of LLDPE on processability and physical properties
title_full The influence of long chain branches of LLDPE on processability and physical properties
title_fullStr The influence of long chain branches of LLDPE on processability and physical properties
title_full_unstemmed The influence of long chain branches of LLDPE on processability and physical properties
title_sort The influence of long chain branches of LLDPE on processability and physical properties
author Dartora,Paula Cristina
author_facet Dartora,Paula Cristina
Santana,Ruth Marlene Campomanes
Moreira,Ana Cristina Fontes
author_role author
author2 Santana,Ruth Marlene Campomanes
Moreira,Ana Cristina Fontes
author2_role author
author
dc.contributor.author.fl_str_mv Dartora,Paula Cristina
Santana,Ruth Marlene Campomanes
Moreira,Ana Cristina Fontes
dc.subject.por.fl_str_mv LLDPE
metallocene
long chain branching
NMR
rheology
mechanical properties
topic LLDPE
metallocene
long chain branching
NMR
rheology
mechanical properties
description Two polyethylene-based on single-site metallocene catalyst (mLLDPE) were selected to characterize the effect of long chain branching (LCB) on blown film processability, optical and mechanical properties. 13C NMR and parallel plate rheology were used to identify LCB presence on LLDPEs. Blown films were produced from 100% LLDPEs using three different machine direction (MD) stretch ratios. When the same processing conditions for the two LLDPEs grades were used, better processability was observed for LLDPE with LCB. In relation to mechanical and physical properties, Elmendorf tear and optical properties were highly influenced by the presence of LCB. Tear resistance is affected by film orientation and is inversely proportional to the level of LCB in the polymer. It was observed a reduction of 50% in the MD tear strength when comparing with the polymer without LCB. However, haze decreases significantly with the presence of LCB, about 40%.
publishDate 2015
dc.date.none.fl_str_mv 2015-12-01
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=S0104-14282015000600531
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282015000600531
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/0104-1428.1732
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 Associação Brasileira de Polímeros
publisher.none.fl_str_mv Associação Brasileira de Polímeros
dc.source.none.fl_str_mv Polímeros v.25 n.6 2015
reponame:Polímeros (São Carlos. Online)
instname:Associação Brasileira de Polímeros (ABPol)
instacron:ABPO
instname_str Associação Brasileira de Polímeros (ABPol)
instacron_str ABPO
institution ABPO
reponame_str Polímeros (São Carlos. Online)
collection Polímeros (São Carlos. Online)
repository.name.fl_str_mv Polímeros (São Carlos. Online) - Associação Brasileira de Polímeros (ABPol)
repository.mail.fl_str_mv ||revista@abpol.org.br
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