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: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/147195
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 Dartora, Paula CristinaSantana, Ruth Marlene CampomanesMoreira, Ana Cristina Fontes2016-08-13T02:15:49Z20150104-1428http://hdl.handle.net/10183/147195000990365Two 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%.application/pdfengPolímeros (São Carlos): ciência e tecnologia. Vol. 25, no. 6 (Nov./Dec. 2015), p. 531-539Polietileno linear de baixa densidadeMetalocenosPropriedades mecânicasLLDPEMetalloceneLong chain branchingNMRRheologyMechanical propertiesThe influence of long chain branches of LLDPE on processability and physical propertiesThe influence of long chain branches of linear low density polyethylene on processability and physical properties info:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000990365.pdf000990365.pdfTexto completo (inglês)application/pdf2448532http://www.lume.ufrgs.br/bitstream/10183/147195/1/000990365.pdff0e508463c2ef144dcf2880db076dd8aMD51TEXT000990365.pdf.txt000990365.pdf.txtExtracted Texttext/plain35635http://www.lume.ufrgs.br/bitstream/10183/147195/2/000990365.pdf.txt5ca3016660a904b1ebf4fe778fa616d7MD52THUMBNAIL000990365.pdf.jpg000990365.pdf.jpgGenerated Thumbnailimage/jpeg2202http://www.lume.ufrgs.br/bitstream/10183/147195/3/000990365.pdf.jpg472c9a9d16515ace9a6a14ff97d38621MD5310183/1471952018-10-29 08:34:43.679oai:www.lume.ufrgs.br:10183/147195Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-29T11:34:43Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv The influence of long chain branches of LLDPE on processability and physical properties
dc.title.alternative.en.fl_str_mv The influence of long chain branches of linear low density polyethylene 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
Polietileno linear de baixa densidade
Metalocenos
Propriedades mecânicas
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 Polietileno linear de baixa densidade
Metalocenos
Propriedades mecânicas
topic Polietileno linear de baixa densidade
Metalocenos
Propriedades mecânicas
LLDPE
Metallocene
Long chain branching
NMR
Rheology
Mechanical properties
dc.subject.eng.fl_str_mv 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.issued.fl_str_mv 2015
dc.date.accessioned.fl_str_mv 2016-08-13T02:15:49Z
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/147195
dc.identifier.issn.pt_BR.fl_str_mv 0104-1428
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dc.language.iso.fl_str_mv eng
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dc.relation.ispartof.pt_BR.fl_str_mv Polímeros (São Carlos): ciência e tecnologia. Vol. 25, no. 6 (Nov./Dec. 2015), p. 531-539
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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