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Moisture sorption in polyamide 6.6: experimental investigation and comparison to four physical-based models 5
Broudin, Morgane; Le Saux, V.; Le Gac, Pierre-yves; Champy, C.; Robert, G.; Charrier, P.; Marco, Y..
Water sorption in polyamide 6.6 has been characterized for a wide range of temperature (25°C to 80°C) and various water activities using a Dynamic Vapor Sorption testing machine. Complex sorption mechanisms govern the water uptake in the material. The competition between two main temperature dependant mechanisms has been observed: a Henry’s sorption mechanism that mainly governs the sorption curve at low water activities, and a second mechanism at high water activities that could be related to the formation of water clusters. It is observed that the temperature dependency can mainly be attributed to the Henry’s contribution. Four physically based models are then used and identified thanks to the extended experimental database. It is shown that a simple...
Tipo: Text Palavras-chave: Polyamide 6.6; Water sorption; Temperature; Relative humidity; Physically-based models.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00252/36371/34911.pdf
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Impact of fillers (short glass fibers and rubber) on the hydrolysis-induced embrittlement of polyamide 6.6 5
Le Gac, Pierre Yves; Fayolle, Bruno.
This study deals with the durability of composites based on polyamide 6.6 (PA6.6) in a humid environment, and more especially, with the loss of fracture properties. It is known that PA6.6 undergoes plasticization in the presence of water, but hydrolysis also occurs. This hydrolysis leads to a sharp decline in fracture properties in resin. The aim of this study is thus to understand the behavior of two PA6.6-based composites, one containing short glass fibers and the other both glass fibers and a rubber. The results showed the transition from ductile to brittle behavior as a function of hydrolysis time in resin. For composites, the drop in elongation breaking with the macromolecular chain length was linear for all ageing conditions considered here without...
Tipo: Text Palavras-chave: Polyamide 6.6; Hydrolysis; Fracture; Embrittlement; Reinforced plastics.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00450/56197/57755.pdf
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