Details

Autor(en) / Beteiligte

• Lin, Shaoting
• Liu, Xinyue
• Liu, Ji
• Yuk, Hyunwoo
• Loh, Hyun-Chae
• Parada, German A
• Settens, Charles
• Song, Jake
• Masic, Admir
• McKinley, Gareth H
• Zhao, Xuanhe

Titel

Anti-fatigue-fracture hydrogels

Ist Teil von

• Science advances, 2019-01, Vol.5 (1), p.eaau8528-eaau8528

Ort / Verlag

United States: American Association for the Advancement of Science

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• The emerging applications of hydrogels in devices and machines require hydrogels to maintain robustness under cyclic mechanical loads. Whereas hydrogels have been made tough to resist fracture under a single cycle of mechanical load, these toughened gels still suffer from fatigue fracture under multiple cycles of loads. The reported fatigue threshold for synthetic hydrogels is on the order of 1 to 100 J/m . We propose that designing anti-fatigue-fracture hydrogels requires making the fatigue crack encounter and fracture objects with energies per unit area much higher than that for fracturing a single layer of polymer chains. We demonstrate that the controlled introduction of crystallinity in hydrogels can substantially enhance their anti-fatigue-fracture properties. The fatigue threshold of polyvinyl alcohol (PVA) with a crystallinity of 18.9 weight % in the swollen state can exceed 1000 J/m .