弹性体
材料科学
粘弹性
韧性
增韧
复合材料
变硬
耗散系统
高分子科学
热力学
物理
作者
Juliette Slootman,C. Joshua Yeh,Pierre Millereau,Jean Comtet,Costantino Creton
标识
DOI:10.1073/pnas.2116127119
摘要
SignificanceSoft materials can be toughened by creating dissipative mechanisms in stretchy matrixes. Yet using them over a wide range of temperatures requires dissipative mechanisms independent of stretch rate or temperature. We show that sacrificial covalent bonds in multiple network elastomers are most useful in toughening elastomers at high temperature and act synergistically with viscoelasticity at lower temperature. We do not attribute this toughening mechanism only to the scission of bonds during crack propagation but propose that the highly stretched network diluted in a stretchy matrix acts by simultaneously stiffening the elastomer and delaying the localization of bond scission and the propagation of a crack. Such a toughening mechanism has never been proposed for elastomers and should guide network design.
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