Front Cover: Inspired by the concept of the sacrificial bond, a strong yet sacrificial interface composed of metal-ligand coordination bonds is engineered in an elastomer/graphene composite. The strong interface ensures a high efficient stress transfer, meanwhile it is sacrificial during stretching, which dissipates enormous energy and facilitates rubber chain orientation. As a result, the composite exhibits a remarkable improvement in both strength and toughness. Further details can be found in the article by J. Huang, Z. Tang, Z. Yang, and B. Guo* on page 1040.
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