ESR 2: Elise Sabattié

IMG_8079Elise holds a Master’s degree in polymer physico chemistry from the National Graduate School of Chemistry, Biology and Physics (ENSCBP) and a Master’s degree in materials chemistry and physico-chemistry from the University of Bordeaux, France.

She has been working on the important problem of small molecule migration through polymer matrices from an experimental viewpoint. Molecular migration is crucial in areas such as determining the stability and performance of adhesives and the migration of active ingredients through polymer membranes in unit-dose applications. The ability to understand and control migration leading to more predictable performance would reduce over-engineering of many products, allow better predictions of product stability, potentially extending product lifetimes.

Elise has been performing a range of experiments to measure segregation in a number of model systems where the chemical compatibility of migrant and matrix is systematically changed. Using a combination of ion beam analysis and neutron reflectometry on selectively-deuterated samples she has measured systems which change systematically from a homogenous distribution to weak segregation (where migrant concentration falls of exponentially with depth) to formation of a wetting layer which is thick on the molecular lengthscale. Elise’s experimental data provide a stringent test of Salvatore’s theoretical developments; we find that his models provide excellent two-parameter explanations of the data allowing estimation of surface energy and surface composition. Elise is now working at P&G in Germany on low-field NMR-based methods to determine the depth profile of oligomers over lengthscales up to 2 mm – completing the link between microscopic phenomenology on model systems and P&G products. She’ll also be probing Salvatore’s predictions on elasticity-control of migration experimentally. Her first paper on the experimental methods she’s developed is in preparation.

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“Predicting Oligomer/Polymer Compatibility and its Impact on Nanoscale Segregation in Thin Films.”, E. F. D. Sabattié, J. Tasche, M. R. Wilson, M. W. A. Skoda, A. Hughes, T. Lindner and R. L. Thompson, Soft Matter, accepted April 2017, DOI: 10.1039/C7SM00048K.

“Blooming of Smectic Surfactant/Plasticizer Layers on Spin-Cast Poly(vinyl alcohol) Films.”, A. Briddick, R. J. Fong, E. F. D. Sabattié, P.Li, M. W. A. Skoda, F. Courchay, R. L. Thompson, Langmuir

THESIS: “Oligomer/polymer mixtures as model adhesives: Impact of compatibility on surface segregation behaviour”, E. F. D. Sabattié.


authors: J. Evans and E. Sabattie