Abstract
The swelling of a dry cylindrical poly(acrylic acid-co-acrylamide) gel was observed in real time after immersed in water. Pattern formation was found during this process. The wetting process is divided into three stages: first, swelling in the radial direction with cusp-like patterns evolving on the surface; second, shrinking in the radial direction while swelling in the axial direction; the last one, re-swelling in the radial direction. The movement of the wetting front at the first stage exhibits Case II like diffusion of water in polymeric network.
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Ji, S., Ding, J. The Wetting Process of a Dry Polymeric Hydrogel. Polym J 34, 267–270 (2002). https://doi.org/10.1295/polymj.34.267
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DOI: https://doi.org/10.1295/polymj.34.267
