Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites
https://orcid.org/0000-0003-4066-1156
https://orcid.org/0000-0002-1452-1136
https://orcid.org/0000-0003-0524-6336
https://orcid.org/0000-0001-7982-3576
Abstract 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 CO 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.
Graphical abstract Display Omitted
Highlights The influence of the sepiolite on the behavior of the nanocomposites after UV exposure has been studied. Sepiolite has an inhibitor effect on the formation of CO. The crystallographic arrangement of PA66 and sepiolite hinders the oxygen diffusion. The breaking of chains is lower in nanocomposites due of the sepiolite.
Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites
https://orcid.org/0000-0003-4066-1156
https://orcid.org/0000-0002-1452-1136
https://orcid.org/0000-0003-0524-6336
https://orcid.org/0000-0001-7982-3576
Abstract 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 CO 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.
Graphical abstract Display Omitted
Highlights The influence of the sepiolite on the behavior of the nanocomposites after UV exposure has been studied. Sepiolite has an inhibitor effect on the formation of CO. The crystallographic arrangement of PA66 and sepiolite hinders the oxygen diffusion. The breaking of chains is lower in nanocomposites due of the sepiolite.
Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites
https://orcid.org/0000-0003-4066-1156
https://orcid.org/0000-0002-1452-1136
https://orcid.org/0000-0003-0524-6336
https://orcid.org/0000-0001-7982-3576
Abstract 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 CO 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.
Graphical abstract Display Omitted
Highlights The influence of the sepiolite on the behavior of the nanocomposites after UV exposure has been studied. Sepiolite has an inhibitor effect on the formation of CO. The crystallographic arrangement of PA66 and sepiolite hinders the oxygen diffusion. The breaking of chains is lower in nanocomposites due of the sepiolite.
Photo-oxidative degradation of injection molded sepiolite/polyamide66 nanocomposites
Fernández-Barranco, C. (Autor:in) / Yebra-Rodríguez, A. (Autor:in) / Jiménez-Millán, J. (Autor:in) / Navas-Martos, F.J. (Autor:in) / Yebra, A. (Autor:in) / Koziol, A.E. (Autor:in) / La Rubia, M.D. (Autor:in)
Applied Clay Science ; 189
03.03.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Polyamide66/National Bentonite Clay Nanocomposites Membranes for Water-Oil Separation
| British Library Online Contents | 2012
Study of Polyamide66/Bentonite Clay Hybrid Membranes Obtained by Solution
| British Library Online Contents | 2012
Novel bioactive nanohydroxyapatite/polyamide66 composite membrane for guided bone regeneration
| British Library Online Contents | 2008
Study of spatial distribution of sepiolite in sepiolite/polyamide6,6 nanocomposites
| Online Contents | 2016