Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites

Every day clay/polymer nanocomposites are included in more industrial applications, due to its high performance. Because of this, nanocomposites may be submitted to extreme conditions of work, which could degrade it. Exposure to solar radiation in the presence of oxygen (photo-degradation) represent...

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Autores: Fernández-Barranco, Cristina, Yebra-Rodríguez, África, Jiménez-Millán, Juan, Navas-Martos, Francisco Javier, Yebra, Ana, Koziol, A.E., La Rubia, M.Dolores
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2020
País:España
Institución:Universidad de Jaén
Repositorio:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
OAI Identifier:oai:ruja.ujaen.es:10953/3450
Acceso en línea:https://www.sciencedirect.com/science/article/pii/S0169131720301101
https://hdl.handle.net/10953/3450
Access Level:acceso abierto
Palabra clave:Polyamide66, Sepiolite, Clay/Polymer Nanocomposites, UV exposure, Photo-oxidation
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spelling Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocompositesFernández-Barranco, CristinaYebra-Rodríguez, ÁfricaJiménez-Millán, JuanNavas-Martos, Francisco JavierYebra, AnaKoziol, A.E.La Rubia, M.DoloresPolyamide66, Sepiolite, Clay/Polymer Nanocomposites, UV exposure, Photo-oxidationEvery day clay/polymer nanocomposites are included in more industrial applications, due to its high performance. Because of this, nanocomposites may be submitted to extreme conditions of work, which could degrade it. Exposure to solar radiation in the presence of oxygen (photo-degradation) represents one of the major problems of the Clay/Polymer anocomposites. In this study, samples of neat polyamide 66 (PA66-S-0) and reinforced nanocomposites with 1, 3, 5, 7 and 9 wt% organophilized sepiolite (PA66-S-1, PA66-S-3, PA66-S-5, PA66-S-7 and PA66-S-9 samples) are analysed after UV exposure, following the standard accelerated degradation method UNE-EN-ISO 4892-2. The aim of this study is to establish the effect of UV exposure on the mechanical, optical and crystallographic properties of the new material. Tensile tests show a reduction in the ductility and an embrittlement after degradation process. In addition, an increase of transparency is confirmed with the UV exposure. The carbonyl index in the samples containing sepiolite is lower than in neat PA66 whereas the yellowness index is not affected by degradation. Sepiolite has an inhibitor effect on the formation of C=O bonds. These results indicate that breaking of chains of PA66 starts in the amorphous region and that it is lower in the nanocomposites due to the low diffusion of oxygen induced by the sepiolite. This affirmation is corroborated by the obtained diffraction patterns.This research was supported by Centro de Estudios Avanzados en Ciencias de la Tierra (University of Jaén, Spain), Andalusian Research Groups RNM-325, TEP-138 (CICE, 14JA, Spain). The authors thank CICT (U 309 niversity of Jaén, Spain), CIC (University of 310 Granada, Spain), and the technicians for data collection.Elsevier202420242020info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://www.sciencedirect.com/science/article/pii/S0169131720301101https://hdl.handle.net/10953/3450reponame:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaéninstname:Universidad de JaénInglésApplied Clay Science [2020]; [189]: [105545]CC0 1.0 Universalhttp://creativecommons.org/publicdomain/zero/1.0/info:eu-repo/semantics/openAccessoai:ruja.ujaen.es:10953/34502026-06-24T12:41:07Z
dc.title.none.fl_str_mv Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites
title Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites
spellingShingle Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites
Fernández-Barranco, Cristina
Polyamide66, Sepiolite, Clay/Polymer Nanocomposites, UV exposure, Photo-oxidation
title_short Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites
title_full Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites
title_fullStr Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites
title_full_unstemmed Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites
title_sort Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites
dc.creator.none.fl_str_mv Fernández-Barranco, Cristina
Yebra-Rodríguez, África
Jiménez-Millán, Juan
Navas-Martos, Francisco Javier
Yebra, Ana
Koziol, A.E.
La Rubia, M.Dolores
author Fernández-Barranco, Cristina
author_facet Fernández-Barranco, Cristina
Yebra-Rodríguez, África
Jiménez-Millán, Juan
Navas-Martos, Francisco Javier
Yebra, Ana
Koziol, A.E.
La Rubia, M.Dolores
author_role author
author2 Yebra-Rodríguez, África
Jiménez-Millán, Juan
Navas-Martos, Francisco Javier
Yebra, Ana
Koziol, A.E.
La Rubia, M.Dolores
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Polyamide66, Sepiolite, Clay/Polymer Nanocomposites, UV exposure, Photo-oxidation
topic Polyamide66, Sepiolite, Clay/Polymer Nanocomposites, UV exposure, Photo-oxidation
description Every day clay/polymer nanocomposites are included in more industrial applications, due to its high performance. Because of this, nanocomposites may be submitted to extreme conditions of work, which could degrade it. Exposure to solar radiation in the presence of oxygen (photo-degradation) represents one of the major problems of the Clay/Polymer anocomposites. In this study, samples of neat polyamide 66 (PA66-S-0) and reinforced nanocomposites with 1, 3, 5, 7 and 9 wt% organophilized sepiolite (PA66-S-1, PA66-S-3, PA66-S-5, PA66-S-7 and PA66-S-9 samples) are analysed after UV exposure, following the standard accelerated degradation method UNE-EN-ISO 4892-2. The aim of this study is to establish the effect of UV exposure on the mechanical, optical and crystallographic properties of the new material. Tensile tests show a reduction in the ductility and an embrittlement after degradation process. In addition, an increase of transparency is confirmed with the UV exposure. The carbonyl index in the samples containing sepiolite is lower than in neat PA66 whereas the yellowness index is not affected by degradation. Sepiolite has an inhibitor effect on the formation of C=O bonds. These results indicate that breaking of chains of PA66 starts in the amorphous region and that it is lower in the nanocomposites due to the low diffusion of oxygen induced by the sepiolite. This affirmation is corroborated by the obtained diffraction patterns.
publishDate 2020
dc.date.none.fl_str_mv 2020
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://www.sciencedirect.com/science/article/pii/S0169131720301101
https://hdl.handle.net/10953/3450
url https://www.sciencedirect.com/science/article/pii/S0169131720301101
https://hdl.handle.net/10953/3450
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Applied Clay Science [2020]; [189]: [105545]
dc.rights.none.fl_str_mv CC0 1.0 Universal
http://creativecommons.org/publicdomain/zero/1.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv CC0 1.0 Universal
http://creativecommons.org/publicdomain/zero/1.0/
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:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
instname:Universidad de Jaén
instname_str Universidad de Jaén
reponame_str RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
collection RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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