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Thermo-Hydro-Glycol Ageing of Polyamide 6,6: Microstructure-Properties Relationships

The microstructural evolutions occurring during the thermo-hydro-glycol ageing of an injection molded PA66 were studied. They were correlated to the evolutions of its mechanical properties. The aged samples were immersed in an antifreeze fluid—mainly composed of water and ethylene glycol—at varying...

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Autores principales: Laügt, Clément, Bouvard, Jean-Luc, Robert, Gilles, Billon, Noëlle
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9572785/
https://www.ncbi.nlm.nih.gov/pubmed/36236045
http://dx.doi.org/10.3390/polym14194097
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author Laügt, Clément
Bouvard, Jean-Luc
Robert, Gilles
Billon, Noëlle
author_facet Laügt, Clément
Bouvard, Jean-Luc
Robert, Gilles
Billon, Noëlle
author_sort Laügt, Clément
collection PubMed
description The microstructural evolutions occurring during the thermo-hydro-glycol ageing of an injection molded PA66 were studied. They were correlated to the evolutions of its mechanical properties. The aged samples were immersed in an antifreeze fluid—mainly composed of water and ethylene glycol—at varying times and temperatures. The aim was to combine an as exhaustive as possible microstructural investigation and a rigorous mechanical analysis. Consequently, the microstructure of the aged and unaged PA66 was assessed through the average molar mass, the diameter of the spherulites, the lamellae thickness, the crystallite’s apparent size, a crystal perfection index, and a crystallinity index. Moreover, a core-skin approach was set up. The mechanical consequences of the microstructural changes were investigated by DMA and tensile testing. The local true strain fields were measured with a digital image correlation system. The temperatures and strain rates of the tests were chosen by referring to the time-temperature superposition principle. It is concluded that the water and ethylene glycol intake resulted in an intense plasticization, the loss of the molar mass resulted in the embrittling of the polymer, and finally, it was identified that the changes of the crystalline structure have an influence on the stiffness of PA66.
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spelling pubmed-95727852022-10-17 Thermo-Hydro-Glycol Ageing of Polyamide 6,6: Microstructure-Properties Relationships Laügt, Clément Bouvard, Jean-Luc Robert, Gilles Billon, Noëlle Polymers (Basel) Article The microstructural evolutions occurring during the thermo-hydro-glycol ageing of an injection molded PA66 were studied. They were correlated to the evolutions of its mechanical properties. The aged samples were immersed in an antifreeze fluid—mainly composed of water and ethylene glycol—at varying times and temperatures. The aim was to combine an as exhaustive as possible microstructural investigation and a rigorous mechanical analysis. Consequently, the microstructure of the aged and unaged PA66 was assessed through the average molar mass, the diameter of the spherulites, the lamellae thickness, the crystallite’s apparent size, a crystal perfection index, and a crystallinity index. Moreover, a core-skin approach was set up. The mechanical consequences of the microstructural changes were investigated by DMA and tensile testing. The local true strain fields were measured with a digital image correlation system. The temperatures and strain rates of the tests were chosen by referring to the time-temperature superposition principle. It is concluded that the water and ethylene glycol intake resulted in an intense plasticization, the loss of the molar mass resulted in the embrittling of the polymer, and finally, it was identified that the changes of the crystalline structure have an influence on the stiffness of PA66. MDPI 2022-09-30 /pmc/articles/PMC9572785/ /pubmed/36236045 http://dx.doi.org/10.3390/polym14194097 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Laügt, Clément
Bouvard, Jean-Luc
Robert, Gilles
Billon, Noëlle
Thermo-Hydro-Glycol Ageing of Polyamide 6,6: Microstructure-Properties Relationships
title Thermo-Hydro-Glycol Ageing of Polyamide 6,6: Microstructure-Properties Relationships
title_full Thermo-Hydro-Glycol Ageing of Polyamide 6,6: Microstructure-Properties Relationships
title_fullStr Thermo-Hydro-Glycol Ageing of Polyamide 6,6: Microstructure-Properties Relationships
title_full_unstemmed Thermo-Hydro-Glycol Ageing of Polyamide 6,6: Microstructure-Properties Relationships
title_short Thermo-Hydro-Glycol Ageing of Polyamide 6,6: Microstructure-Properties Relationships
title_sort thermo-hydro-glycol ageing of polyamide 6,6: microstructure-properties relationships
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9572785/
https://www.ncbi.nlm.nih.gov/pubmed/36236045
http://dx.doi.org/10.3390/polym14194097
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