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Unusual Fracture Behavior of Slide-Ring Gels with Movable Cross-Links
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-12-04 00:00:00 , DOI: 10.1021/acsmacrolett.7b00729 Chang Liu 1 , Hirokazu Kadono 1 , Koichi Mayumi 1 , Kazuaki Kato 1 , Hideaki Yokoyama 1 , Kohzo Ito 1
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-12-04 00:00:00 , DOI: 10.1021/acsmacrolett.7b00729 Chang Liu 1 , Hirokazu Kadono 1 , Koichi Mayumi 1 , Kazuaki Kato 1 , Hideaki Yokoyama 1 , Kohzo Ito 1
Affiliation
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In this study, the quasi-static fracture behavior of slide-ring gels (SR gels), in which movable cross-links can slide on polymer chains, is for the first time investigated and compared to that of conventional polymer gels with fixed cross-links (FC gels). For the usual FC gels, there is a trade-off relation between toughness (fracture energy 
) and stiffness (Young’s modulus E): with increasing cross-linking density, the Young’s modulus E increases, while fracture energy 
decreases. However, SR gels show an unusual fracture behavior that contradicts this trade-off relation. The fracture energy of SR gels is independent of the Young’s modulus, in other words, the cross-linking density; moreover, it rises with increasing slidable range of movable cross-links on polymer chains. A new molecular model is proposed by attributing the unusual fracture properties of SR gels to the relative sliding movement between polymer chains and cross-links. Utilizing this concept, simultaneous fulfillment of high stiffness and high toughness in polymer gels can be realized.
中文翻译：
具有可移动交联的滑环凝胶的异常断裂行为
在这项研究中，第一次研究了滑动环凝胶（SR 凝胶）的准静态断裂行为，其中可移动的交联键可以在聚合物链上滑动，并与传统的固定交联聚合物凝胶进行了比较。链接（FC 凝胶）。对于通常的 FC 凝胶，韧性（断裂能）和刚度（杨氏模量E ）之间存在折衷关系：随着交联密度的增加，杨氏模量E增加，而断裂能减少。然而，SR 凝胶表现出不寻常的断裂行为，这与这种权衡关系相矛盾。SR凝胶的断裂能与杨氏模量无关，即与交联密度无关；此外，它随着聚合物链上可移动交联的可滑动范围的增加而上升。通过将 SR 凝胶的不寻常断裂特性归因于聚合物链和交联之间的相对滑动运动，提出了一种新的分子模型。利用这一概念，可以同时实现聚合物凝胶的高刚度和高韧性。
更新日期：2017-12-04
) and stiffness (Young’s modulus E): with increasing cross-linking density, the Young’s modulus E increases, while fracture energy decreases. However, SR gels show an unusual fracture behavior that contradicts this trade-off relation. The fracture energy of SR gels is independent of the Young’s modulus, in other words, the cross-linking density; moreover, it rises with increasing slidable range of movable cross-links on polymer chains. A new molecular model is proposed by attributing the unusual fracture properties of SR gels to the relative sliding movement between polymer chains and cross-links. Utilizing this concept, simultaneous fulfillment of high stiffness and high toughness in polymer gels can be realized.
中文翻译：
具有可移动交联的滑环凝胶的异常断裂行为
在这项研究中，第一次研究了滑动环凝胶（SR 凝胶）的准静态断裂行为，其中可移动的交联键可以在聚合物链上滑动，并与传统的固定交联聚合物凝胶进行了比较。链接（FC 凝胶）。
对于通常的 FC 凝胶，韧性（断裂能）和刚度（杨氏模量E ）之间存在折衷关系：随着交联密度的增加，杨氏模量E增加，而断裂能减少。然而，SR 凝胶表现出不寻常的断裂行为，这与这种权衡关系相矛盾。SR凝胶的断裂能与杨氏模量无关，即与交联密度无关；此外，它随着聚合物链上可移动交联的可滑动范围的增加而上升。通过将 SR 凝胶的不寻常断裂特性归因于聚合物链和交联之间的相对滑动运动，提出了一种新的分子模型。利用这一概念，可以同时实现聚合物凝胶的高刚度和高韧性。
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