Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates
Autor(a) principal: | |
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Data de Publicação: | 2016 |
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/1822/38370 |
Resumo: | A one-step melt-mixing method is proposed to study dispersion and re-agglomeration phenomena of the as-received and functionalized graphite nanoplates in polypropylene melts. Graphite nanoplates were chemically modified via 1,3-dipolar cycloaddition of an azomethine ylide and then grafted with polypropylene-graft-maleic anhydride. The effect of surface functionalization on the dispersion kinetics, nanoparticle re-agglomeration and interface bonding with the polymer is investigated. Nanocomposites with 2 or 10 wt% of as-received and functionalized graphite nanoplates were prepared in a small-scale prototype mixer coupled to a capillary rheometer. Samples were collected along the flow axis and characterized by optical microscopy, scanning electron microscopy and electrical conductivity measurements. The as-received graphite nanoplates tend to re-agglomerate upon stress relaxation of the polymer melt. The covalent attachment of a polymer to the nanoparticle surface enhances the stability of dispersion, delaying the re-agglomeration. Surface modification also improves interfacial interactions and the resulting composites presented improved electrical conductivity. |
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Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplatesMelt mixingPolymerGraphite nanoplateDispersionRe-agglomerationEngenharia e Tecnologia::Engenharia dos MateriaisScience & TechnologyA one-step melt-mixing method is proposed to study dispersion and re-agglomeration phenomena of the as-received and functionalized graphite nanoplates in polypropylene melts. Graphite nanoplates were chemically modified via 1,3-dipolar cycloaddition of an azomethine ylide and then grafted with polypropylene-graft-maleic anhydride. The effect of surface functionalization on the dispersion kinetics, nanoparticle re-agglomeration and interface bonding with the polymer is investigated. Nanocomposites with 2 or 10 wt% of as-received and functionalized graphite nanoplates were prepared in a small-scale prototype mixer coupled to a capillary rheometer. Samples were collected along the flow axis and characterized by optical microscopy, scanning electron microscopy and electrical conductivity measurements. The as-received graphite nanoplates tend to re-agglomerate upon stress relaxation of the polymer melt. The covalent attachment of a polymer to the nanoparticle surface enhances the stability of dispersion, delaying the re-agglomeration. Surface modification also improves interfacial interactions and the resulting composites presented improved electrical conductivity.The authors acknowledge the financial support to Project Matepro Optimizing Materials and Processes, with reference NORTE-07-0124-FEDER-000037 by the Programa Operacional Regional do Norte (ON.2) and Portuguese Foundation for the Science and Technology (FCT) for PEst-C/CTM/LA0025/2013. EC acknowledges FCT for a PhD grant SFRH/BD/87214/2012.Royal Society of ChemistryUniversidade do MinhoSantos, R. M.Vilaverde, C.Cunha, E.Paiva, M. C.Covas, J. A.20162016-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/38370engSantos, R. M., Vilaverde, C., Cunha, E., Paiva, M. C., & Covas, J. A. (2016). Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates. Soft Matter, 12(1), 77-86. doi: 10.1039/c5sm01366f1744-683X10.1039/c5sm01366finfo: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:RCAAP2023-07-21T12:08:50ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates |
title |
Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates |
spellingShingle |
Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates Santos, R. M. Melt mixing Polymer Graphite nanoplate Dispersion Re-agglomeration Engenharia e Tecnologia::Engenharia dos Materiais Science & Technology |
title_short |
Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates |
title_full |
Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates |
title_fullStr |
Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates |
title_full_unstemmed |
Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates |
title_sort |
Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates |
author |
Santos, R. M. |
author_facet |
Santos, R. M. Vilaverde, C. Cunha, E. Paiva, M. C. Covas, J. A. |
author_role |
author |
author2 |
Vilaverde, C. Cunha, E. Paiva, M. C. Covas, J. A. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Santos, R. M. Vilaverde, C. Cunha, E. Paiva, M. C. Covas, J. A. |
dc.subject.por.fl_str_mv |
Melt mixing Polymer Graphite nanoplate Dispersion Re-agglomeration Engenharia e Tecnologia::Engenharia dos Materiais Science & Technology |
topic |
Melt mixing Polymer Graphite nanoplate Dispersion Re-agglomeration Engenharia e Tecnologia::Engenharia dos Materiais Science & Technology |
description |
A one-step melt-mixing method is proposed to study dispersion and re-agglomeration phenomena of the as-received and functionalized graphite nanoplates in polypropylene melts. Graphite nanoplates were chemically modified via 1,3-dipolar cycloaddition of an azomethine ylide and then grafted with polypropylene-graft-maleic anhydride. The effect of surface functionalization on the dispersion kinetics, nanoparticle re-agglomeration and interface bonding with the polymer is investigated. Nanocomposites with 2 or 10 wt% of as-received and functionalized graphite nanoplates were prepared in a small-scale prototype mixer coupled to a capillary rheometer. Samples were collected along the flow axis and characterized by optical microscopy, scanning electron microscopy and electrical conductivity measurements. The as-received graphite nanoplates tend to re-agglomerate upon stress relaxation of the polymer melt. The covalent attachment of a polymer to the nanoparticle surface enhances the stability of dispersion, delaying the re-agglomeration. Surface modification also improves interfacial interactions and the resulting composites presented improved electrical conductivity. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016 2016-01-01T00:00:00Z |
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/1822/38370 |
url |
http://hdl.handle.net/1822/38370 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Santos, R. M., Vilaverde, C., Cunha, E., Paiva, M. C., & Covas, J. A. (2016). Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates. Soft Matter, 12(1), 77-86. doi: 10.1039/c5sm01366f 1744-683X 10.1039/c5sm01366f |
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 |
Royal Society of Chemistry |
publisher.none.fl_str_mv |
Royal Society of Chemistry |
dc.source.none.fl_str_mv |
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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) |
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repository.mail.fl_str_mv |
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1777303691529814016 |