Mechanical Properties of Self-Recovery Tough Gels with Permanent and Reversible Crosslinks
Mechanical Properties of Self-Recovery Tough Gels with Permanent and Reversible Crosslinks
复制标题
具有永久和可逆交联的自恢复韧性凝胶的机械性能
DOI：
10.1295/koron.2015-0041
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
C. Creton
中科院分区：
文献类型：
--
作者：
K. Mayumi;T. Narita;C. Creton
介绍了我们最近在具有共价和可逆交联度的自恢复双交联凝胶的线性粘弹性、大变形行为和断裂特性方面所做的工作。瞬时交联物的断裂会耗散应变能，提高凝胶的断裂韧性和延伸性。我们已经开发出具有永久和可逆交联性的“双交联型”凝胶。PVA双交联凝胶具有明确的线性流变学可逆键寿命，是定量研究可断交联链的断裂/愈合动力学与宏观力学性能关系的良好模型体系。我们进行了各种应变历史拉伸测量，如应力松弛、连续加载和加载/卸载试验，以分离可逆交联体的断裂和愈合对宏观应力的影响。我们还建立了应力-应变关系的物理模型，确定了物理交联物的断裂/愈合时间。
We introduce our recent work on linear viscoelasticity, large deformation behaviour and fracture properties of self-recovery dual crosslink gels having covalent and reversible crosslinks. The breakage of transient crosslinks dissipates strain energy and enhances the fracture toughness and extensibility of the gels. We have developed model "dual cross-link" gels, having permanent and reversible crosslinks simultaneously. The PVA dual crosslink gels are good model systems to investigate quantitatively the relationship between the breaking/healing dynamics of the breakable crosslinks and the macroscopic mechanical properties because they have a well-defined life time of the reversible bonds observed by linear rheology. We have performed various strain history tensile measurements, such as stress relaxation, continuous loading, and loading/unloading tests, to separate the effect of the breaking and healing of the reversible crosslinks on macroscopic stress. Also we have developed a physical model for the stress-strain relation and determined the breaking/healing time of the physical crosslinks.