Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 72: Polymer Networks and Elastomers
CPP 72.8: Talk
Wednesday, March 18, 2020, 17:15–17:30, ZEU 114
Tough and Instantly Recoverable Hydrogels: Self-Reinforcement by Strain-Induced Crystallization — •koichi mayumi1, chang liu1, jiang lan1, takamasa sakai2, hideaki yokoyama1, and kohzo ito1 — 1Graduate School of Frontier Sciences, The University of Tokyo, Chiba, Japan — 2Graduate School of Engineering, The University of Tokyo, Tokyo, Japan
Most tough hydrogels are reinforced by introducing sacrificial structures that can dissipate input energy [1]. However, since the sacrificial damages cannot recover instantly, the toughness of these gels drops substantially during consecutive cyclic loadings. In this presentation, we will propose a new damageless reinforcement strategy for hydrogels utilizing strain-induced crystallization (SIC). In Slide-Ring (SR) gels where polyethylene glycol (PEG) chains are cross-linked by rings [2,3], crystalline of PEG repetitively forms and destructs with elongation and relaxation, resulting in both excellent toughness of 5.5 to 25.2 MJ/m^3 and 87% to 95% instant recovery of extension energy between two consecutive loading-unloading cycles. The instantly reversible tough hydrogels are promising candidates for applications in artificial connective tissues such as tendon and ligament.
[1] J. P. Gong, Soft Matter, 6, 2583 (2010). [2] K. Ito, Polymer Journal, 39, 489 (2007). [3] L. Jiang, C. Liu, K. Mayumi, K. Kato, H. Yokoyama, K. Ito, Chemistry of Materials, 30, 5013 (2018).