Wrinkling of a nanometric glassy skin/crust induced by drying in poly(vinyl alcohol) gels

Abstract : During drying of a chemically crosslinked poly(vinyl alcohol) gel, we observed, by atomic force microscopy (AFM) and scanning electronic microscopy, micron-order wrinkling which remains until the end of drying. We show that while at high humidity drying is homogeneous and no surface instability is observed, fast drying at low humidity induces the formation of a glassy skin layer on the soft bulk that wrinkles because the skin is compressed as the bulk contracts. The role of the glass transition is not only to create a mismatch of the elasticity with the bulk but also to remove the in-plane tensile tension which stretches the skin before drying. We proved experimentally the presence of this thin glassy skin on the wet bulk by approach–retract curve measurements in AFM. We also comment on the effect of mechanical restraint and the observation of hierarchical wrinkling over different length scales.
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Article dans une revue
Soft Matter, Royal Society of Chemistry, 2012, 8 (31), pp.8075-8081 〈10.1039/C2SM25480H〉
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Soumis le : vendredi 23 juin 2017 - 18:10:45
Dernière modification le : mardi 27 mars 2018 - 16:06:21

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Karine Huraux, Tetsuharu Narita, Bruno Bresson, Christian Frétigny, François Lequeux. Wrinkling of a nanometric glassy skin/crust induced by drying in poly(vinyl alcohol) gels. Soft Matter, Royal Society of Chemistry, 2012, 8 (31), pp.8075-8081 〈10.1039/C2SM25480H〉. 〈hal-01546405〉

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