Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets
Autor(a) principal: | |
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Data de Publicação: | 2018 |
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/1822/59335 |
Resumo: | A recently made available form of graphene nanoplatelets (GNP-C) is investigated for the first time as reinforcement filler for PLA. GNP-C, with thickness of about 2 nm and length 1-2 m, was incorporated at different loadings (0.1-0.5 wt%) in poly(lactic acid) (PLA) by melt blending. The effect of varying mixing time and mixing intensity was studied and the best conditions were identified, corresponding to mixing for 20 min at 50 rpm and 180 degrees C. Thermal analysis (differential scanning calorimetry and thermogravimetric analysis) indicated no relevant differences between pristine PLA and the composites. However, the rate of thermal degradation increased with loading, due to the dominant effect of heat transfer enhancement over mass transfer hindrance. Raman spectroscopy allowed confirming that increasing graphene loading or decreasing mixing time translates into higher nanoplatelet agglomeration, in agreement with the observed mechanical performance and scanning electron microscopy imaging of the composites. The composites exhibited maximum mechanical performance at a loading of 0.25wt%: 20% increase in tensile strength, 12% increase in Young's modulus, and 16% increase in toughness. The incorporation of 0.25wt% GNP-C did not affect human fibroblasts (HFF-1) metabolic activity or morphology. POLYM. COMPOS., 39:E308-E320, 2018. |
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Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplateletsScience & TechnologyA recently made available form of graphene nanoplatelets (GNP-C) is investigated for the first time as reinforcement filler for PLA. GNP-C, with thickness of about 2 nm and length 1-2 m, was incorporated at different loadings (0.1-0.5 wt%) in poly(lactic acid) (PLA) by melt blending. The effect of varying mixing time and mixing intensity was studied and the best conditions were identified, corresponding to mixing for 20 min at 50 rpm and 180 degrees C. Thermal analysis (differential scanning calorimetry and thermogravimetric analysis) indicated no relevant differences between pristine PLA and the composites. However, the rate of thermal degradation increased with loading, due to the dominant effect of heat transfer enhancement over mass transfer hindrance. Raman spectroscopy allowed confirming that increasing graphene loading or decreasing mixing time translates into higher nanoplatelet agglomeration, in agreement with the observed mechanical performance and scanning electron microscopy imaging of the composites. The composites exhibited maximum mechanical performance at a loading of 0.25wt%: 20% increase in tensile strength, 12% increase in Young's modulus, and 16% increase in toughness. The incorporation of 0.25wt% GNP-C did not affect human fibroblasts (HFF-1) metabolic activity or morphology. POLYM. COMPOS., 39:E308-E320, 2018.This work was financially supported by: Flupol - Surface Engineering S.A., Project POCI-01-0145-FEDER-006939 (Laboratory for Process Engineering, Environment, Biotechnology and Energy - LEPABE funded by FEDER funds through COMPETE2020 - Programa Operacional Competitividade e Internacionalizacao (POCI) - and by national funds through FCT - Fundaccao para a Ciencia e a Tecnologia.Artur Pinto wishes to thank Fundacao para a Ciencia e a Tecnologia (FCT) for PhD grant SFRH/BD/86974/2012, funded by European Social Fund and Portuguese Ministry of Education and Science (MEC) through Programa Operacional Capital Humano (POCH).info:eu-repo/semantics/publishedVersionWileyUniversidade do MinhoGoncalves, CarolinaPinto, ArturMachado, A. V.Moreira, JoaquimGoncalves, Ines C.Magalhaes, Fernao20182018-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/59335eng0272-839710.1002/pc.24050info: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:RCAAP2023-07-21T12:13:47Zoai:repositorium.sdum.uminho.pt:1822/59335Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:05:57.443183Repositório 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 |
Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets |
title |
Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets |
spellingShingle |
Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets Goncalves, Carolina Science & Technology |
title_short |
Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets |
title_full |
Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets |
title_fullStr |
Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets |
title_full_unstemmed |
Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets |
title_sort |
Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets |
author |
Goncalves, Carolina |
author_facet |
Goncalves, Carolina Pinto, Artur Machado, A. V. Moreira, Joaquim Goncalves, Ines C. Magalhaes, Fernao |
author_role |
author |
author2 |
Pinto, Artur Machado, A. V. Moreira, Joaquim Goncalves, Ines C. Magalhaes, Fernao |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Goncalves, Carolina Pinto, Artur Machado, A. V. Moreira, Joaquim Goncalves, Ines C. Magalhaes, Fernao |
dc.subject.por.fl_str_mv |
Science & Technology |
topic |
Science & Technology |
description |
A recently made available form of graphene nanoplatelets (GNP-C) is investigated for the first time as reinforcement filler for PLA. GNP-C, with thickness of about 2 nm and length 1-2 m, was incorporated at different loadings (0.1-0.5 wt%) in poly(lactic acid) (PLA) by melt blending. The effect of varying mixing time and mixing intensity was studied and the best conditions were identified, corresponding to mixing for 20 min at 50 rpm and 180 degrees C. Thermal analysis (differential scanning calorimetry and thermogravimetric analysis) indicated no relevant differences between pristine PLA and the composites. However, the rate of thermal degradation increased with loading, due to the dominant effect of heat transfer enhancement over mass transfer hindrance. Raman spectroscopy allowed confirming that increasing graphene loading or decreasing mixing time translates into higher nanoplatelet agglomeration, in agreement with the observed mechanical performance and scanning electron microscopy imaging of the composites. The composites exhibited maximum mechanical performance at a loading of 0.25wt%: 20% increase in tensile strength, 12% increase in Young's modulus, and 16% increase in toughness. The incorporation of 0.25wt% GNP-C did not affect human fibroblasts (HFF-1) metabolic activity or morphology. POLYM. COMPOS., 39:E308-E320, 2018. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018 2018-01-01T00:00:00Z |
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/1822/59335 |
url |
http://hdl.handle.net/1822/59335 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0272-8397 10.1002/pc.24050 |
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 |
Wiley |
publisher.none.fl_str_mv |
Wiley |
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 |
instacron_str |
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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1799132472933351424 |