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Highlighting The Role of Ionic Liquids in The Control of The Morphology of Immiscible Polymer Blends By Interfacial Tension Assessment

Abstract : During the last decade, number of studies has demonstrated the potential of organo-modified nanoparticles as compatibilizing agent of immiscible polymer blends. However, if the effect is known, its origin remains partially understood only and the control of this compatibilization way remains imperfect. This study aims at elucidating separately the effects of the ionic liquid (ILs, surfactant) and of the nanofiller in the stabilization of morphology of polymer blends. PP/PA-6 (80/20 w/w) systems were chosen as model of immiscible polymer blend and were compounded adding solely ionic liquids (similar to those used to modify the various organoclays). Tetraalkylammonium salts containing the same chloride-based anion but differing by the polarity of their cations were introduced at various concentrations and the polymer blends were processed by twin-screw extrusion using a laboratory scale extruder. Then, a microcompounder equipped with a rheological slit capillary die was used to determine the relative melt viscosity from the pressure drop in the recirculation channel. The Rabinowitsch correction was implemented to calculate the non-Newtonian viscosity of each formulation. Scanning electron microscopy allowed investigating the influence of ILs on the different morphologies of the binary polymer blends. The Serpe equation was also used for this purpose to estimate the interfacial tension, which takes into account the effect of the ILs on the variation of the viscosity ratio in each formulation. The changes in the morphologies and polydispersity evolution of dispersed phase of the blends as a function of the surfactant amount show that this compatibilizing effect should be attributed mainly to the reduction of interfacial tension during the melt processing, the viscosity ratio reduction being less significant. In addition, the ionic liquid-compatibilized blends exhibit great improvement in the thermal properties compared to the uncompatibilized blends.
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Contributor : Mohamed Yousfi Connect in order to contact the contributor
Submitted on : Friday, May 16, 2014 - 12:10:34 PM
Last modification on : Wednesday, June 8, 2022 - 9:06:05 AM


  • HAL Id : hal-00992082, version 1


Mohamed Yousfi, Maxime Lebeau, Jeremie Soulestin, Marie-France Lacrampe, Patricia Krawczak. Highlighting The Role of Ionic Liquids in The Control of The Morphology of Immiscible Polymer Blends By Interfacial Tension Assessment. AERC (Annual European Rheology Conference), The European Society of Rheology, Apr 2014, Karlsruhe, Germany. ⟨hal-00992082⟩



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