Composite Films of Nanofibrillated Cellulose with Sepiolite: Effect of Preparation Strategy
Autor(a) principal: | |
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Data de Publicação: | 2022 |
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/10316/99240 https://doi.org/10.3390/coatings12030303 |
Resumo: | Cellulose nanofibrils (CNFs) are nanomaterials with promising properties to be used in food packaging and printed electronics, thus being logical substitutes to petroleum-based polymers, specifically plastics. CNFs can be combined with other materials, such as clay minerals, to form composites, which are environmentally friendly materials, with acceptable costs and without compromising the final properties of the composite material. To produce composite films, two strategies can be used: solvent casting and filtration followed by hot pressing. The first approach is the simplest way to produce films, but the obtained films may present some limitations. In the present work, CNFs produced using enzymatic or TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical) oxidation pretreatments, followed by high-pressure homogenization, or only by mechanical treatment (homogenization), were used to produce films by both the available procedures. The films obtained by filtration + hot pressing presented higher tensile strength and Young’s modulus compared with those obtained by solvent casting. In general, a decrease in the values of these mechanical properties of the films and a decrease in elongation at break, with the addition of sepiolite, were also observed. However, for the TEMPO CNF-based films, an improvement in tensile strength could be observed for 10% of the sepiolite content. Furthermore, the time necessary to produce films was largely reduced by employing the filtration procedure. Finally, the water vapour barrier properties of the films obtained by filtration are comparable to the literature values of net CNF films. Thus, this technique demonstrates to be the most suitable to produce CNF-based composite films in a fast way and with improved mechanical properties and suitable gas barrier properties |
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Composite Films of Nanofibrillated Cellulose with Sepiolite: Effect of Preparation StrategyBiodegradable materialsNanocomposite filmsTensile strengthYoung’s modulusWater permeabilityCellulose nanofibrils (CNFs) are nanomaterials with promising properties to be used in food packaging and printed electronics, thus being logical substitutes to petroleum-based polymers, specifically plastics. CNFs can be combined with other materials, such as clay minerals, to form composites, which are environmentally friendly materials, with acceptable costs and without compromising the final properties of the composite material. To produce composite films, two strategies can be used: solvent casting and filtration followed by hot pressing. The first approach is the simplest way to produce films, but the obtained films may present some limitations. In the present work, CNFs produced using enzymatic or TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical) oxidation pretreatments, followed by high-pressure homogenization, or only by mechanical treatment (homogenization), were used to produce films by both the available procedures. The films obtained by filtration + hot pressing presented higher tensile strength and Young’s modulus compared with those obtained by solvent casting. In general, a decrease in the values of these mechanical properties of the films and a decrease in elongation at break, with the addition of sepiolite, were also observed. However, for the TEMPO CNF-based films, an improvement in tensile strength could be observed for 10% of the sepiolite content. Furthermore, the time necessary to produce films was largely reduced by employing the filtration procedure. Finally, the water vapour barrier properties of the films obtained by filtration are comparable to the literature values of net CNF films. Thus, this technique demonstrates to be the most suitable to produce CNF-based composite films in a fast way and with improved mechanical properties and suitable gas barrier propertiesMDPI2022info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/99240http://hdl.handle.net/10316/99240https://doi.org/10.3390/coatings12030303eng2079-6412Alves, LuísRamos, AnaRasteiro, Maria G.Vitorino, CarlaFerraz, EduardoFerreira, Paulo J. T.Puertas, Maria L.Gamelas, José A. F.info: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:RCAAP2023-09-21T13:41:10Zoai:estudogeral.uc.pt:10316/99240Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:16:53.955975Repositório 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 |
Composite Films of Nanofibrillated Cellulose with Sepiolite: Effect of Preparation Strategy |
title |
Composite Films of Nanofibrillated Cellulose with Sepiolite: Effect of Preparation Strategy |
spellingShingle |
Composite Films of Nanofibrillated Cellulose with Sepiolite: Effect of Preparation Strategy Alves, Luís Biodegradable materials Nanocomposite films Tensile strength Young’s modulus Water permeability |
title_short |
Composite Films of Nanofibrillated Cellulose with Sepiolite: Effect of Preparation Strategy |
title_full |
Composite Films of Nanofibrillated Cellulose with Sepiolite: Effect of Preparation Strategy |
title_fullStr |
Composite Films of Nanofibrillated Cellulose with Sepiolite: Effect of Preparation Strategy |
title_full_unstemmed |
Composite Films of Nanofibrillated Cellulose with Sepiolite: Effect of Preparation Strategy |
title_sort |
Composite Films of Nanofibrillated Cellulose with Sepiolite: Effect of Preparation Strategy |
author |
Alves, Luís |
author_facet |
Alves, Luís Ramos, Ana Rasteiro, Maria G. Vitorino, Carla Ferraz, Eduardo Ferreira, Paulo J. T. Puertas, Maria L. Gamelas, José A. F. |
author_role |
author |
author2 |
Ramos, Ana Rasteiro, Maria G. Vitorino, Carla Ferraz, Eduardo Ferreira, Paulo J. T. Puertas, Maria L. Gamelas, José A. F. |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
Alves, Luís Ramos, Ana Rasteiro, Maria G. Vitorino, Carla Ferraz, Eduardo Ferreira, Paulo J. T. Puertas, Maria L. Gamelas, José A. F. |
dc.subject.por.fl_str_mv |
Biodegradable materials Nanocomposite films Tensile strength Young’s modulus Water permeability |
topic |
Biodegradable materials Nanocomposite films Tensile strength Young’s modulus Water permeability |
description |
Cellulose nanofibrils (CNFs) are nanomaterials with promising properties to be used in food packaging and printed electronics, thus being logical substitutes to petroleum-based polymers, specifically plastics. CNFs can be combined with other materials, such as clay minerals, to form composites, which are environmentally friendly materials, with acceptable costs and without compromising the final properties of the composite material. To produce composite films, two strategies can be used: solvent casting and filtration followed by hot pressing. The first approach is the simplest way to produce films, but the obtained films may present some limitations. In the present work, CNFs produced using enzymatic or TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical) oxidation pretreatments, followed by high-pressure homogenization, or only by mechanical treatment (homogenization), were used to produce films by both the available procedures. The films obtained by filtration + hot pressing presented higher tensile strength and Young’s modulus compared with those obtained by solvent casting. In general, a decrease in the values of these mechanical properties of the films and a decrease in elongation at break, with the addition of sepiolite, were also observed. However, for the TEMPO CNF-based films, an improvement in tensile strength could be observed for 10% of the sepiolite content. Furthermore, the time necessary to produce films was largely reduced by employing the filtration procedure. Finally, the water vapour barrier properties of the films obtained by filtration are comparable to the literature values of net CNF films. Thus, this technique demonstrates to be the most suitable to produce CNF-based composite films in a fast way and with improved mechanical properties and suitable gas barrier properties |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022 |
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/10316/99240 http://hdl.handle.net/10316/99240 https://doi.org/10.3390/coatings12030303 |
url |
http://hdl.handle.net/10316/99240 https://doi.org/10.3390/coatings12030303 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
2079-6412 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
MDPI |
publisher.none.fl_str_mv |
MDPI |
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 |
instname_str |
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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1799134064643407872 |