Communication Dans Un Congrès Année : 2025

From Melt to Solid-State Rheology: Understanding the Effect of Gas Content on the Morphology and Mechanical Properties of HDPE Foams

Résumé

The development of lightweight polymer foams while maintaining good mechanical properties requires a thorough understanding of the rheological behavior of polymer/gas systems under conditions representative of the MuCell injection foaming process. In this study, we investigated high-density polyethylene (HDPE) in the presence of supercritical nitrogen (ScN₂) through high-pressure rheological measurements using a rheometer equipped with a dedicated pressure cell. These experiments allowed us to evaluate the influence of gas solubility and pressure on the viscosity and viscoelastic properties of the polymer melt. These results were complemented by PVT, solubility, and interfacial tension measurements, by high-pressure differential scanning calorimetry (HP-DSC) analyses, as well as by scanning electron microscopy (SEM) observations. Together, these investigations provided insights into the effect of gas content on foam cellular morphology. Additional investigations were carried out in solid-state rheology, through DMA creep tests and compression experiments performed on DHR-2, to assess the influence of gas content on the mechanical behavior of foams. In parallel, a numerical simulation of cell growth was performed to link processing conditions with foam structure stability. The results obtained provide a basis for a better understanding of the impact of gas content on the final mechanical properties. Looking ahead, tomography analyses will be conducted for a more detailed characterization of the morphology, and online rheology tests using an instrumented die on the Clextral line will enable real-time monitoring of the rheological behavior of HDPE/N₂ systems under high pressure. These developments, combined with numerical modeling and parameter estimation, are expected to provide deeper insights into the relationships between physicochemical properties, processing conditions, structure, and the final mechanical properties of foams.

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Dates et versions

hal-05283874 , version 1 (25-09-2025)

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  • HAL Id : hal-05283874 , version 1

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Achref Elhasni, Mohamed Yousfi, Jannick Duchet-Rumeau, Abderrahim Maazouz. From Melt to Solid-State Rheology: Understanding the Effect of Gas Content on the Morphology and Mechanical Properties of HDPE Foams. Young Rheologists’ Day 2025, Groupe Français de Rhéologie, Nov 2025, Paris, France. ⟨hal-05283874⟩
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