Internal Damage Evolution in Double-Network Hydrogels Studied by Microelectrode Technique

Published on Sep 13, 2019in Macromolecules5.918
· DOI :10.1021/ACS.MACROMOL.9B01308
Honglei Guo13
Estimated H-index: 13
(Hokkaido University),
Wei Hong35
Estimated H-index: 35
(SU: Southern University and A&M College)
+ 7 AuthorsJian Ping Gong79
Estimated H-index: 79
(Hokkaido University)
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 by using the microelectrode technique (MET) based on the Donnan effect of the polyelectrolyte first network. We measure the spatial distribution of the electric potential of the prestretched and then reswelled DN gels. From the anisotropic depth profiles of potential and reswelling ratio, the microstructures of DN gels at a scale larger than the microelectrode probe size (∼200 nm) are revealed at the preyielding, yielding, and strain-hardening regimes.
📖 Papers frequently viewed together
85 Citations
460 Citations
26 Citations
Cited By4
#1Xiaohui Yu (Donghua University)H-Index: 1
#2Zheng Yong (Donghua University)H-Index: 3
Last. Tianxi Liu (Donghua University)H-Index: 87
view all 6 authors...
1 CitationsSource
#1Qin Chen (Sichuan University)H-Index: 2
#2Lan Feng (Sichuan University)H-Index: 1
Last. Changsheng Zhao (Sichuan University)H-Index: 62
view all 8 authors...
Developing ultra-stretchable, universally sticky, and highly conductive nanocomposite hydrogels without doping agents and nanoparticle-aggregation is still a challenge. Herein, doping-free and nanoparticle-aggregation-inhibited hydrogels composed of Fe3+, dopamine (DA), pyrrole (Py) and polyacrylic acid (PAA) were prepared. Polypyrrole-polydopamine (PPy-PDA)/PAA hydrogels were quickly formed due to the abundant ionic bonds and physical cross-linking under the addition of Fe3+. Moreover, the H+ i...
6 CitationsSource
#1Manxi Sun (Akita Prefectural University)H-Index: 4
#2Jianhui Qiu (Akita Prefectural University)H-Index: 24
Last. Eiichi Sakai (Akita Prefectural University)H-Index: 15
view all 5 authors...
Abstract The conductive hydrogels with high recovery property applied in electronic sensor fields have recently attracted more and more attention. However, it remains a challenge to simply develop gel-based sensors with excellent toughness, recovery ability and stretch stability. In this work, a tough double crosslinked hydrogel (DC-Gel) was obtained from polyvinyl alcohol/poly (acrylic acid) (PVA/PAA) by facilely visible light triggered polymerization and subsequent salt impregnation. The ionic...
4 CitationsSource