Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/38358 |
Resumo: | The kinetics of GnP dispersion in polypropylene melt was studied using a prototype small scale modular extensional mixer. Its modular nature enabled the sequential application of a mixing step, melt relaxation, and a second mixing step. The latter could reproduce the flow conditions on the first mixing step, or generate milder flow conditions. The effect of these sequences of flow constraints upon GnP dispersion along the mixer length was studied for composites with 2 and 10 wt.% GnP. The samples collected along the first mixing zone showed a gradual decrease of number and size of GnP agglomerates, at a rate that was independent of the flow conditions imposed to the melt, but dependent on composition. The relaxation zone induced GnP re-agglomeration, and the application of a second mixing step caused variable dispersion results that were largely dependent on the hydrodynamic stresses generated. |
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Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditionsNanocompositesElectrical propertiesOptical microscopyExtrusionA. NanocompositesB. Electrical propertiesD. Optical microscopyE. ExtrusionEngenharia e Tecnologia::Engenharia dos MateriaisScience & TechnologyThe kinetics of GnP dispersion in polypropylene melt was studied using a prototype small scale modular extensional mixer. Its modular nature enabled the sequential application of a mixing step, melt relaxation, and a second mixing step. The latter could reproduce the flow conditions on the first mixing step, or generate milder flow conditions. The effect of these sequences of flow constraints upon GnP dispersion along the mixer length was studied for composites with 2 and 10 wt.% GnP. The samples collected along the first mixing zone showed a gradual decrease of number and size of GnP agglomerates, at a rate that was independent of the flow conditions imposed to the melt, but dependent on composition. The relaxation zone induced GnP re-agglomeration, and the application of a second mixing step caused variable dispersion results that were largely dependent on the hydrodynamic stresses generated.Project Matepro – Optimizing Materials and Processes (NORTE-07-0124-FEDER-000037) by Programam Operacional Regional do Norte (ON.2)ElsevierUniversidade do MinhoVilaverde, C.Santos, R. M.Paiva, M. C.Covas, J. A.2015-082015-08-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/38358engVilaverde, C., Santos, R. M., Paiva, M. C., & Covas, J. A. (2015). Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions. Composites Part A: Applied Science and Manufacturing, 78, 143-151. doi: 10.1016/j.compositesa.2015.08.0101359-835X10.1016/j.compositesa.2015.08.010info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:02:23Zoai:repositorium.sdum.uminho.pt:1822/38358Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T18:52:20.918170Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions |
title |
Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions |
spellingShingle |
Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions Vilaverde, C. Nanocomposites Electrical properties Optical microscopy Extrusion A. Nanocomposites B. Electrical properties D. Optical microscopy E. Extrusion Engenharia e Tecnologia::Engenharia dos Materiais Science & Technology |
title_short |
Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions |
title_full |
Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions |
title_fullStr |
Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions |
title_full_unstemmed |
Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions |
title_sort |
Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions |
author |
Vilaverde, C. |
author_facet |
Vilaverde, C. Santos, R. M. Paiva, M. C. Covas, J. A. |
author_role |
author |
author2 |
Santos, R. M. Paiva, M. C. Covas, J. A. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Vilaverde, C. Santos, R. M. Paiva, M. C. Covas, J. A. |
dc.subject.por.fl_str_mv |
Nanocomposites Electrical properties Optical microscopy Extrusion A. Nanocomposites B. Electrical properties D. Optical microscopy E. Extrusion Engenharia e Tecnologia::Engenharia dos Materiais Science & Technology |
topic |
Nanocomposites Electrical properties Optical microscopy Extrusion A. Nanocomposites B. Electrical properties D. Optical microscopy E. Extrusion Engenharia e Tecnologia::Engenharia dos Materiais Science & Technology |
description |
The kinetics of GnP dispersion in polypropylene melt was studied using a prototype small scale modular extensional mixer. Its modular nature enabled the sequential application of a mixing step, melt relaxation, and a second mixing step. The latter could reproduce the flow conditions on the first mixing step, or generate milder flow conditions. The effect of these sequences of flow constraints upon GnP dispersion along the mixer length was studied for composites with 2 and 10 wt.% GnP. The samples collected along the first mixing zone showed a gradual decrease of number and size of GnP agglomerates, at a rate that was independent of the flow conditions imposed to the melt, but dependent on composition. The relaxation zone induced GnP re-agglomeration, and the application of a second mixing step caused variable dispersion results that were largely dependent on the hydrodynamic stresses generated. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-08 2015-08-01T00:00:00Z |
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://hdl.handle.net/1822/38358 |
url |
http://hdl.handle.net/1822/38358 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Vilaverde, C., Santos, R. M., Paiva, M. C., & Covas, J. A. (2015). Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions. Composites Part A: Applied Science and Manufacturing, 78, 143-151. doi: 10.1016/j.compositesa.2015.08.010 1359-835X 10.1016/j.compositesa.2015.08.010 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799132298758586368 |