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Keywords = thermo-hydro-glycol ageing

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23 pages, 8968 KiB  
Article
Thermo-Hydro-Glycol Ageing of Polyamide 6,6: Microstructure-Properties Relationships
by Clément Laügt, Jean-Luc Bouvard, Gilles Robert and Noëlle Billon
Polymers 2022, 14(19), 4097; https://doi.org/10.3390/polym14194097 - 30 Sep 2022
Cited by 7 | Viewed by 2880
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Advances in the Mechanical Behavior of Polymeric Materials)
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