Fracture, fatigue, and friction of polymers in which entanglements greatly outnumber cross-links
Fracture, fatigue, and friction of polymers in which entanglements greatly outnumber cross-links
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DOI：
10.1126/science.abg6320
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发表时间：
2021-10-08
期刊：
影响因子：
56.9
通讯作者：
Suo, Zhigang
中科院分区：
文献类型：
--
作者：
Kim, Junsoo;Zhang, Guogao;Suo, Zhigang
在凝胶和弹性体中，缠结对变形的作用已经被研究，但它们对断裂、疲劳和摩擦的影响还不是很清楚。在这项研究中，我们合成了缠结数量远远超过交联量的聚合物。密集的缠结使得聚合物链中的张力能够沿其长度传递到许多其他链。稀疏的交联链阻止了聚合物链的解缠。这些聚合物具有高韧性、高强度和抗疲劳性。在水中浸泡后，聚合物膨胀到平衡，由此产生的水凝胶具有低滞后、低摩擦和高耐磨性。
In gels and elastomers, the role of entanglements on deformation has been studied, but their effects on fracture, fatigue, and friction are less well understood. In this study, we synthesized polymers in which entanglements greatly outnumber cross-links. The dense entanglements enable transmission of tension in a polymer chain along its length and to many other chains. The sparse cross-links prevent the polymer chains from disentangling. These polymers have high toughness, strength, and fatigue resistance. After submersion in water, the polymers swell to equilibrium, and the resulting hydrogels have low hysteresis, low friction, and high wear resistance.