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Issue 31, 2012
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Reversible adhesion between a hydrogel and a polymer brush

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We have developed a new experimental methodology to investigate the adhesive properties of hydrogels on solid surfaces under fully immersed conditions. The method, based on contact mechanics, provides time-resolved reproducible and quantitative data on the work of adhesion between a hydrogel at swelling equilibrium and a planar surface grafted with responsive brushes. We used poly(N,N-dimethylacrylamide) (PDMA) and polyacrylamide (PAM) as model gels and poly(acrylic acid) (PAA) as pH dependent polymer brush. The effect of pH, contact time and debonding velocity on adhesive interactions was specifically investigated. As expected from molecular interactions, we found that adhesion increased as the pH decreased and this was attributed to the formation of hydrogen bonds at the interface. Surprisingly, however, the buildup of adhesion increased slowly with the time of contact up to one hour and depended markedly on debonding velocity despite the very elastic nature of the hydrogels. Furthermore, the maximum pH where adhesion was observed was significantly higher for the couple PAM–PAA than for the couple PDMA–PAA, in contrast with the onset of molecular interactions in dilute solutions.

Graphical abstract: Reversible adhesion between a hydrogel and a polymer brush

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Publication details

The article was received on 13 Apr 2012, accepted on 08 Jun 2012 and first published on 03 Jul 2012

Article type: Paper
DOI: 10.1039/C2SM25868D
Soft Matter, 2012,8, 8184-8193

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    Reversible adhesion between a hydrogel and a polymer brush

    G. Sudre, L. Olanier, Y. Tran, D. Hourdet and C. Creton, Soft Matter, 2012, 8, 8184
    DOI: 10.1039/C2SM25868D

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