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Microgel structure-driven linear and non-linear mechanical properties of self-assembled microgel films

Abstract : Soft self-supported cohesive films were formed by self-assembly of pH- and thermo-responsive P(MEO2MA-co-OEGMA-co-MAA) microgels without any preparation and/or post-treatments. Linear and non-linear mechanical properties of those films were characterized respectively by dynamic mechanical measurements at low strain and uniaxial extensional tests at high deformation. A relationship between the microstructure of microgels and the mechanical strength of microgel-based films was successfully established. Compared to microgels crosslinked with Oligo(ethylene glycol) diacrylate (OEGDA), microgels with N,N-methylenebisacrylamide (MBA) demonstrate a less crosslinked structure but especially a looser shell which enables the particles to better interpenetrate between one another and resist to higher deformation. Novel films were also designed by controlled mixing microgels and the synthesis side-product, namely water-soluble polymer, WSP, in a ratio with WSP content till 100 %. Those films demonstrated promising mechanical properties due to the structural characteristics of the later. The later act as a lever to tune the elastic modulus of films without diminishing their resistance at strain thanks to its high molar mass and crosslinked structure revealed by Steric Exclusion Chromatography (SEC) measurements.
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https://hal-univ-pau.archives-ouvertes.fr/hal-03126992
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Submitted on : Monday, February 1, 2021 - 11:17:11 AM
Last modification on : Tuesday, February 2, 2021 - 2:58:06 PM

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Eva Dieuzy, Stéphane Auguste, Kamel Chougrani, Valérie Alard, Laurent Billon, et al.. Microgel structure-driven linear and non-linear mechanical properties of self-assembled microgel films. Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier, 2021, 613, pp.126082. ⟨10.1016/j.colsurfa.2020.126082⟩. ⟨hal-03126992⟩

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