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Nanofillers are frequently used to improve the mechanical properties of hydrogels, but it is still difficult to develop composite hydrogels with simultaneously enhanced strength, fracture strain, toughness and fatigue threshold at a high water content. Inspired from the unique structure of spider silk, we propose a "macromolecular chain engineered aramid nanofiber (ANF) reinforcement" strategy to prepare strong and fatigue resistance hydrogels with a relatively high water content. ANFs can decrease the crystallinity while increase the stretchability of PVA hydrogels. The stress can be effectively transferred from the soft and ductile polymer chains to the hard and strong ANFs through strong interfacial hydrogen bonding. The tensile strength, fracture strain, toughness and fracture energy of ANF reinforced hydrogels (ARHs) can reach as high as 2.07 +/- 0.15 MPa, 1084 +/- 116 %, 12.66 +/- 1.1 MJ m(-3), and 3196 +/- 219 J m(-2), respectively, at a water content of -80 %. Also, ARHs show great crack propagation resistance with the fatigue threshold up to -157 J m(-2). The bioinspired ARHs with outstanding mechanical properties and anti-swelling performance have promising applications in the field of soft underwater robots, artificial muscles, and so on.
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COMPOSITES SCIENCE AND TECHNOLOGY
ISSN: 0266-3538
Year: 2024
Volume: 252
8 . 3 0 0
JCR@2023
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 1
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