Effect of Relative Strength of Two Networks on the Internal Fracture Process of Double Network Hydrogels As Revealed by in Situ Small-Angle X-ray Scattering

Published on Jan 31, 2020in Macromolecules5.985
路 DOI :10.1021/ACS.MACROMOL.9B02562
Kazuki Fukao4
Estimated H-index: 4
(Hokkaido University),
Tasuku Nakajima37
Estimated H-index: 37
(Hokkaido University)
+ 3 AuthorsJian Ping Gong81
Estimated H-index: 81
(Hokkaido University)
Sources
Abstract
Double network hydrogels (DN gels) exhibit extraordinarily high strength and toughness by interplay of the two contrasting networks: the rigid, brittle network serves as a sacrificial bond that fractures at a relatively low strain, while the soft, stretchable network serves as hidden length that sustains stress by large extension afterward. The internal fracture process of the brittle network strongly depends on the relative strength of the two networks. In this study, we study the internal fracturing process of typical DN gels that show yielding or necking under uniaxial stretching using in situ small-angle X-ray scattering. Two samples consisting of the same brittle first network from poly(2-acrylamido-2-methylpropanesulfonic acid) but stretchable second network from poly(N,N-dimethylacrylamide) of different concentrations were adopted. We found that (1) the brittle network shows nonaffine deformation even far below the yield strain by local fracture; (2) for the sample of low second network concentrati...
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Double-network (DN) hydrogels have attracted considerable attention owing to their unique mechanism to show extraordinary mechanical strength and toughness. Although the toughening mechanism of the DN gels, breaking of the relatively stiff and brittle first network as sacrificial bonds, is widely accepted, the microstructure and morphology evolution of the internal damage have hardly been revealed. In this study, we study the internal structures of the first network in partially damaged DN gels ...
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