Toughening Elastomers with Sacrificial Bonds and Watching Them Break
Toughening Elastomers with Sacrificial Bonds and Watching Them Break
复制标题
DOI：
10.1126/science.1248494
复制
发表时间：
2014-04-11
期刊：
影响因子：
56.9
通讯作者：
Creton, Costantino
中科院分区：
文献类型：
--
作者：
Ducrot, Etienne;Chen, Yulan;Creton, Costantino
弹性体因其大应变可逆变形能力而得到广泛应用。大多数非填充弹性体的机械强度较低，这限制了它们的使用。使用牺牲键，我们展示了如何通过引入不同比例的各向同性预拉伸链，在材料失效之前断裂和耗散能量，从而极大地增强脆性、未填充的弹性体的硬度和韧性(高达4兆帕斯卡和每平方米9千焦)。化学发光的交联分子在断裂时会发光，当许多内部键在扩展的裂缝之前断裂时，它们会实时绘制出地图。我们用来引入牺牲键的简单方法，结合键断裂位置的映射，有可能刺激新的未填充韧性弹性体的发展，以及软材料断裂的更好的分子模型。
Elastomers are widely used because of their large-strain reversible deformability. Most unfilled elastomers suffer from a poor mechanical strength, which limits their use. Using sacrificial bonds, we show how brittle, unfilled elastomers can be strongly reinforced in stiffness and toughness (up to 4 megapascals and 9 kilojoules per square meter) by introducing a variable proportion of isotropically prestretched chains that can break and dissipate energy before the material fails. Chemoluminescent cross-linking molecules, which emit light as they break, map in real time where and when many of these internal bonds break ahead of a propagating crack. The simple methodology that we use to introduce sacrificial bonds, combined with the mapping of where bonds break, has the potential to stimulate the development of new classes of unfilled tough elastomers and better molecular models of the fracture of soft materials.