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Junsoo Kim, Guogao Zhang, Meixuanzi Shi, Zhigang Suo
Longer and stronger; stiff but not brittle Hydrogels are highly water-swollen, cross-linked polymers. Although they can be highly deformed, they tend to be weak, and methods to strengthen or toughen them tend to reduce stretchability. Two papers now report strategies to create tough but deformable hydrogels (see the Perspective by Bosnjak and Silberstein). Wang et al . introduced a toughening mechanism by storing releasable extra chain length in the stiff part of a double-network hydrogel. A high applied force triggered the opening of cycling strands that were only activated at high chain extension. Kim et al . synthesized acrylamide gels in which dense entanglements could be achieved by using unusually low amounts of water, cross-linker, and initiator during the synthesis. This approach improves the mechanical strength in solid form while also improving the wear resistance once swollen as a hydrogel. —MSL
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Kim, J., Zhang, G., Shi, M., & Suo, Z. (2021). Fracture, fatigue, and friction of polymers in which entanglements greatly outnumber cross-links. Science, 374(6564), 212–216. https://doi.org/10.1126/science.abg6320
Kim, Junsoo, et al. "Fracture, fatigue, and friction of polymers in which entanglements greatly outnumber cross-links." Science, vol. 374, no. 6564, 2021, pp. 212–216, https://doi.org/10.1126/science.abg6320.
Kim, Junsoo, Guogao Zhang, Meixuanzi Shi, and Zhigang Suo. "Fracture, fatigue, and friction of polymers in which entanglements greatly outnumber cross-links." Science 374, no. 6564 (2021): 212–216. https://doi.org/10.1126/science.abg6320.
Kim J., Zhang G., Shi M. [и др.] Fracture, fatigue, and friction of polymers in which entanglements greatly outnumber cross-links // Science. — 2021. — Vol. 374, № 6564. — P. 212–216. — URL: https://doi.org/10.1126/science.abg6320
@article{kim2021fracture,
title = {{Fracture, fatigue, and friction of polymers in which entanglements greatly outnumber cross-links}},
author = {Junsoo Kim and Guogao Zhang and Meixuanzi Shi and Zhigang Suo},
journal = {Science},
year = {2021},
volume = {374},
number = {6564},
pages = {212--216},
doi = {10.1126/science.abg6320},
url = {https://doi.org/10.1126/science.abg6320}
}TY - JOUR AU - Kim, Junsoo AU - Zhang, Guogao AU - Shi, Meixuanzi AU - Suo, Zhigang TI - Fracture, fatigue, and friction of polymers in which entanglements greatly outnumber cross-links JO - Science VL - 374 IS - 6564 SP - 212 EP - 216 PY - 2021 DA - 2021/10/08 DO - 10.1126/science.abg6320 UR - https://doi.org/10.1126/science.abg6320 ER -
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