Polymer gels can undergo a volume phase transition (either continuous or discontinuous) when an external condition such as temperature or solvent composition is altered. This phase transition is either a shrinking or a swelling. We investigate the instability of a tubular fluid gel after shrinking. When gels are immersed in a solvent, the polymer network undergoes a diffusion inducing an osmosis pressure through the gel. A bubble and a bamboo pattern were observed under such conditions (E. Sato-Matsuo and T. Tanaka, Nature, 358, 482 (1992)). In this paper we investigate these pattern formations as a mechanical instability.
Publisher
Department of Theoretical and Applied Mechanics (UIUC)
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.
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