Crack velocity dependent toughness of polyrotaxane networks: The sliding dynamics of rings on polymer under stretching
Crack velocity dependent toughness of polyrotaxane networks: The sliding dynamics of rings on polymer under stretching
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DOI：
10.1016/j.mechmat.2021.103784
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发表时间：
2021-02-18
影响因子：
3.9
通讯作者：
Ito, Kohzo
中科院分区：
文献类型：
--
作者：
Liu, Chang;Yokoyama, Hideaki;Ito, Kohzo
我们研究了不同应变速率下聚合物链由环状分子交联的滑环（SR）凝胶的断裂韧性，以评估交联点的滑动速度。SR凝胶在裂纹速度高于临界值时，断裂能急剧下降，因为环的滑动运动跟不上高变形速率。从临界过渡速度出发，估计了单层断裂假设下滑动动力学的特征时间尺度为微秒。
We investigate the fracture toughness of slide-ring (SR) gels, in which polymer chains are cross-linked by ring molecules, at various strain rates to evaluate the sliding speed of the cross-linking points. SR gels show a drastic decrease of the fracture energy at crack velocities higher than a critical value, since the sliding motion of the rings cannot catch up with the high deformation rates. From the critical transition velocity, we estimated the characteristic time scale of the sliding dynamics to be micro-seconds under the single-layer fracture assumption.