Journal
POLYMERS
Volume 12, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/polym12102263
Keywords
double network ionic hydrogel; multi-sacrifice bonds; high toughness; fast recovery; notch-insensitivity
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Funding
- Exploratory Challenging Research of Japan Society for the Promotion of Science [19K21923]
- Grants-in-Aid for Scientific Research [19K21923] Funding Source: KAKEN
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The engineering applications of hydrogels are generally limited by the common problem of their softness and brittlness. In this study, a composite double network ionic hydrogel (CDN-gel) was obtained by the facile visible light triggered polymerization of acrylic acid (AA), polyvinyl alcohol (PVA), and hydrolyzed triethoxyvinylsilane (TEVS) and subsequent salt impregnation. The resulting CDN-gels exhibited high toughness, recovery ability, and notch-insensitivity. The tensile strength, fracture elongation, Young's modulus, and toughness of the CDN-gels reached up to similar to 21 MPa, similar to 700%, similar to 3.5 MPa, and similar to 48 M/m(3), respectively. The residual strain at a strain of 200% was only similar to 25% after stretch-release of 1000 cycles. These properties will enable greater application of these hydrogel materials, especially for the fatigue resistance of tough hydrogels, as well as broaden their applications in damping.
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