Mechanics of slide-ring gels: novel entropic elasticity of a topological network formed by ring and string
- 22 June 2012
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Soft Matter
- Vol. 8 (31), 8179-8183
- https://doi.org/10.1039/c2sm25508a
Abstract
Slide-ring (SR) gels are polymer networks with movable cross-links that are prepared by cross-linking polyrotaxane (PR) in which many cyclic molecules are threaded into a linear polymer chain. The elastic modulus E of SR gels shows a unique dependence on cross-linking density: at a high cross-linking density, E decreases with increasing cross-linking density. This tendency is not in agreement with conventional rubber elasticity theory. In order to explain this abnormal dependence, we propose a novel molecular theory for SR gels, which considers the alignment entropy of cyclic molecules on polymer networks. The alignment yields new entropic elasticity of the slidable network in SR gels.Keywords
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