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Theses

Proprietes a long terme des gaines de polyethylene haute densite utilisees pour les ponts a haubans

Abstract : High density polyethylene (HDPE) is commonly used in civil engineering applications due to its low cost, easy processability, barrier properties, good impermeability and chemical resistance. However, in external environment, several factors such as washing by rain water, ultraviolet radiations (UV) and seasonal temperature variations can cause chemical degradation of HDPE and lead to its embrittlement. The objective of this thesis is firstly, to contribute to a better understanding of the mechanisms governing the durability of HDPE, and secondly, to establish a methodology for diagnosing the state of degradation of industrial sheaths aged on site. For this first part, we studied the process of antioxidants loss during thermal aging in air or water, for HDPE films containing controlled amounts of phenolic and phosphite stabilizers. The second part was devoted to a detailed study of thermo- and photo-oxidation mechanisms of pure HDPE films. Using a multi-scale and multi-technique approach it was possible to assess the impact of accelerated aging on the chemical composition, on the macromolecular and crystalline structures and on the used properties of HDPE. In the last part, the same type of approach has been applied to industrial HDPE sheaths aged on site in order to identify the predominant mechanisms involved in natural aging. Results were discussed in light of the thermal and photochemical mechanisms previously identified for model HDPE films.
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https://pastel.archives-ouvertes.fr/pastel-00562683
Contributor : Jonathan Tireau <>
Submitted on : Thursday, February 3, 2011 - 6:43:25 PM
Last modification on : Friday, July 17, 2020 - 2:54:12 PM
Long-term archiving on: : Wednesday, May 4, 2011 - 3:46:16 AM

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  • HAL Id : pastel-00562683, version 1

Citation

Jonathan Tireau. Proprietes a long terme des gaines de polyethylene haute densite utilisees pour les ponts a haubans. Polymères. Arts et Métiers ParisTech, 2011. Français. ⟨NNT : 2010ENAM0001⟩. ⟨pastel-00562683⟩

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