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Peeling sequentially cured PDMS. (A) A hard PDMS and a soft PDMS adhere through covalent bonds and topological entanglements. (B) Photos of three peeling modes. A middle layer is cured between two precured hard PDMS. The middle layer is colored in red, and its A:B ratio varies from 10:1 to 30:1. (C) Peeling toughness depends on the A:B ratio of the middle layer. Four identical samples are tested for each A:B ratio of the middle layer.
