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Deformation-Tolerant Linkage of Silicone Rubbers and Carbon-Based Elastomers via Chemical and Topological Adhesion

Daohang Cai,Yanhao Yu

Integrating silicone rubbers with carbon-based elastomers is a common practice in assembling stretchable electronics, but weak or rigid interfacial linkages often lead to structural failure under deformation. Here, we present a chemical and topological adhesive (CTA) composed of poly(styrene-isobutylene-styrene) (SIBS) and maleic anhydride-grafted polypropylene (PP-g-MAH) to bridge silicone rubbers and carbon-based elastomers. The CTA synergizes covalent bonding (via amine-anhydride reactions) with topological entanglement (enabled by matched chain reptation), achieves interfacial toughness >200 J m-2 through finger-pressing and can be further increased to >600 J m-2 via hot pressing. The adhered interface can endure 10,000 cycles of 100% stretch and 10 days of exposure to acidic/alkaline solutions (pH 1–13). The CTA applies to various silicone rubbers (e.g., PDMS and Ecoflex) and carbon-based elastomers (e.g., SEBS, SIBS, and SBS). This adhesion strategy significantly increases the interfacial toughness of stretchable devices in practical usage, offering a general solution for deformation-tolerant integration of stretchable electronics.