Skip to Main content Skip to Navigation
Journal articles

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.
Complete list of metadatas

https://hal.sorbonne-universite.fr/hal-01546405
Contributor : Bruno Publis_simm <>
Submitted on : Friday, June 23, 2017 - 6:10:45 PM
Last modification on : Tuesday, October 6, 2020 - 2:58:02 PM

Identifiers

Citation

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⟩

Share

Metrics

Record views

406