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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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/19/4097 |
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| author | Clément Laügt Jean-Luc Bouvard Gilles Robert Noëlle Billon |
| author_facet | Clément Laügt Jean-Luc Bouvard Gilles Robert Noëlle Billon |
| author_sort | Clément Laügt |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-09T21:15:52Z |
| format | Article |
| id | doaj.art-5dddf69cc721494195ebbe20f55b743c |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T21:15:52Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-5dddf69cc721494195ebbe20f55b743c2023-11-23T21:34:12ZengMDPI AGPolymers2073-43602022-09-011419409710.3390/polym14194097Thermo-Hydro-Glycol Ageing of Polyamide 6,6: Microstructure-Properties RelationshipsClément Laügt0Jean-Luc Bouvard1Gilles Robert2Noëlle Billon3MINES Paris, PSL Reaserch University, Center for Materials Forming (CEMEF), CNRS UMR 7635, CS 10207, 06904 Sophia Antipolis, FranceMINES Paris, PSL Reaserch University, Center for Materials Forming (CEMEF), CNRS UMR 7635, CS 10207, 06904 Sophia Antipolis, FranceDOMO Chemicals, POLYTECHNYL France SAS, Avenue Albert Ramboz, 69190 Saint-Fons, FranceMINES Paris, PSL Reaserch University, Center for Materials Forming (CEMEF), CNRS UMR 7635, CS 10207, 06904 Sophia Antipolis, FranceThe 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.https://www.mdpi.com/2073-4360/14/19/4097PA66microstructuremechanical behaviorthermo-hydro-glycol ageing |
| spellingShingle | Clément Laügt Jean-Luc Bouvard Gilles Robert Noëlle Billon Thermo-Hydro-Glycol Ageing of Polyamide 6,6: Microstructure-Properties Relationships Polymers PA66 microstructure mechanical behavior thermo-hydro-glycol ageing |
| 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 | PA66 microstructure mechanical behavior thermo-hydro-glycol ageing |
| url | https://www.mdpi.com/2073-4360/14/19/4097 |
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