Renforcement thermomécanique et amélioration des propriétés barrière aux essences du HDPE par des approches (nano)composites

Abstract : In the recent years, the use of polyolefin and especially Polyethylene are of economic interest resulting in a growing attention concerning the improvement of its properties of use, especially for automotive application. In this context, the reinforcement of its thermomechanical properties and the improvement of its barrier properties to different fuels over an extended temperature range constitute a major scientific and environmental challenge. In this study, we first decided to analyze the impact of silica particles and of an annealing at 125°C under air atmosphere on thermomechanical properties of a HDPE. The second area of research was focused on the improvement of its barrier properties to fuels by the addition of lamellar charges known for their high aspect ratio inducing a tortuosity effect. The impact of these particles on sorption and extraction phenomena was also studied to determine an optimal HDPE-based formulation in order to limit the physical loss of oligomers and antioxidants. The guideline of this project was the determination of Structure / Morphology / Properties relationships to have a better understanding of the involved mechanisms
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Bryan Guichard. Renforcement thermomécanique et amélioration des propriétés barrière aux essences du HDPE par des approches (nano)composites. Matériaux. Université de Lyon, 2019. Français. ⟨NNT : 2019LYSE1031⟩. ⟨tel-02086849⟩

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