Catastrophic Emulsion Inversion Process of Highly Viscous Isosorbide Biobased Polyester Monitored in situ by Torque and Light Backscattering - Université de Lille Accéder directement au contenu
Article Dans Une Revue Journal of oleo science Année : 2018

Catastrophic Emulsion Inversion Process of Highly Viscous Isosorbide Biobased Polyester Monitored in situ by Torque and Light Backscattering

Résumé

Highly viscous hydrophobic isosorbide biobased polyester O/W emulsions are prepared through catastrophic phase inversion. The process is followed in situ with two different methods: torque and light backscattering (LBS). Considering high viscosity of the system, only discontinuous conductivity monitoring is performed for comparison. Torque and LBS allow to highlight the emulsion inversion point (EIP) with relatively close water weight fraction values (fw≈0.20). The torque and LBS signals are rather noisy before inversion (evolution of different structures) and more smooth after phase inversion (continuous aqueous phase). Torque gives a more macroscopic information, representative of the global state of the dispersion. Consistent conductivity and torque measurements suggest indeed an inversion pathway through multiple o/W/O emulsions leading to multiple complex structures before getting continuous aqueous final emulsion. This hypothesis is confirmed with continuous LBS monitoring and microscopic observations. LBS signal seems more complete because it combines the information of conductivity and torque and allows to clearly follow in situ the inversion from the beginning to the end of the process.

Dates et versions

hal-04395734 , version 1 (15-01-2024)

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Citer

Marianne Catté, Jesus Ontiveros, Kenji Aramaki, Christel Pierlot. Catastrophic Emulsion Inversion Process of Highly Viscous Isosorbide Biobased Polyester Monitored in situ by Torque and Light Backscattering. Journal of oleo science, 2018, Journal of oleo science, 67 (8), pp.925-931. ⟨10.5650/jos.ess18057⟩. ⟨hal-04395734⟩
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