Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session D32: Responsive Polymers, Soft Materials, and Hybrids I
2:30 PM–5:30 PM,
Monday, March 2, 2020
Sponsoring Units: DPOLY DSOFT DBIO
Chair: Jinhye Bae, University of California, San Diego
Abstract: D32.00006 : Toughening mechanism of tough and self-healing physical hydrogels
Jian Ping Gong
We revealed that the high toughness of PA hydrogels is a synergistic effect due to multi-scale energy dissipation. We found that, this class of tough gels have a bicontinuous phase separation structure, consisting of a hard phase network and a soft phase network, of ~100 nm in scale. Upon loading, the microscopic deformation of phase structure is perfectly affine up to a quite large macroscopic uniaxial deformation range, followed by a wide nonaffine regime. In affine deformation regime, the breaking of ionic bonds dissipates energy, while in nonaffine deformation regime, hard phase ruptre dissipate energy.
Cui K, Sun T. L, Liang XB, Nakajima K, Ye, Y. N, Chen L, Kurokawa T, Gong J. P. Multi-scale energy dissipation mechanism in tough and self-healing hydrogels. Physical Review Letters, 2018, 121, 185501.
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