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Probing the elongational rheological behaviour at interfaces of immiscible polymer melts using dilational tensiometry: effect of viscosity and temperature on the interfacial properties

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Abstract

Interfacial rheology has become a powerful tool to study the viscoelastic properties of interfaces in several multiphase polymer-based systems such as multilayer liquids containing surfactants, proteins or solid particles, and also in polymer blends, 3D printed multimaterials and coextruded multilayer films. During all these manufacturing processes, the elongational flow at interface is predominant. Nevertheless, direct interfacial rheological measurements in extension devoted to such polymer systems are not plentiful and are often based on indirect modelling methods. In the present work, interfacial dilational rheology testing based on the rising oscillating drop method was used to probe surface (and interfacial) properties of model Newtonian polymer melts: polydimethylsiloxane (PDMS)/polyisobutylene (PIB) systems. The interfacial properties in both oscillatory and static drop experiments were carefully corrected, considering the inertia and the contribution of the coexisting phase viscosities during the processing of the numerical data. The influence of molecular weight and temperature on the interfacial rheological responses was particularly examined. A new approach was developed to determine the dilational relaxation times (τ) of the studied polymer systems using a square pulse relaxation test. It was found that the evolution of τ with the temperature followed an Arrhenius behaviour. A comparison with capillary breakup extensional rheometry revealed similar overall values to those obtained with the pulse method. Finally, using interfacial shear rheology, we focused on the Trouton correlation between shear and dilational surface rheology, and a direct link between shear surface viscosities and elongational relaxation times was evidenced for the first time and over the entire viscosity range studied.

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Acknowledgements

The authors are thankful to Dr. Jean-Luc Bridot and Mr. Christian Boinon (TECLIS Instruments, France) for their recommendations and technical assistance regarding the interfacial rheological measurements carried out with the TRACKER instrument. The authors thank Dr. Nadia El Kissi and Mr. Vincent Verdoot from University of Grenoble Alpes for their help and their assistance regarding the capillary breakup extensional rheometry experiments. The authors also gratefully acknowledge Mr. Murat Arli from INSA Lyon for his help in the design of the high temperature interfacial cell. The authors are grateful to the engineering federation Ingelyse of Lyon University and INSA Lyon via the BQR (Bonus Qualité Recherche) for the financial support. Finally, the authors gratefully acknowledge the French Ministry of Superior Education and Research (MESRI) for the doctoral study grant.

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  1. Université de Lyon, INSA Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, 69621, Villeurbanne, France

    Younes El Omari, Mohamed Yousfi, Jannick Duchet-Rumeau & Abderrahim Maazouz

  2. Hassan II Academy of Science and Technology, Rabat, Morocco

    Abderrahim Maazouz

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  1. Younes El Omari
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El Omari, Y., Yousfi, M., Duchet-Rumeau, J. et al. Probing the elongational rheological behaviour at interfaces of immiscible polymer melts using dilational tensiometry: effect of viscosity and temperature on the interfacial properties. Rheol Acta 61, 613–636 (2022). https://doi.org/10.1007/s00397-022-01364-x

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