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.
Ao Wang,Yufeng Wang,Bing Zhang,Kening Wan,Jixin Zhu,Jingsan Xu,Chao Zhang,Tianxi Liu
The construction of ionic conductive hydrogels with complex deformation tolerance and excellent fatigue resistance is highly demanded yet challenging. Herein, a semi-interpenetrating ionic conductive hydrogel (SICH) is fabricated by a hydrogel-network constrained polymerization of 1-butyl-3-vinylimidazole tetrafluoroborate and acrylic acid in polyethylene oxide aqueous solution. Ascribing to the formation of a dense intermolecular hydrogen-bonded network, the SICH is capable of being stretched up to ~300%, compressed to ~85%, and recovered immediately when the external force is fully released. The SICH can readily work as a high deformation-tolerant ionic conductor for capacitive/resistive bimodal ionic sensors. The ionic sensor not only showed a wide response range to dynamic pressures (0–8 kPa) and excellent cycling stability (500 cycles) in a capacitive mode, but also demonstrated high sensitivity (gauge factor of ~1.1), excellent linear response (0–300% strain) and fast response time (80 ms) in a resistive mode. As a demonstration, a wearable bimodal SICH ionic sensor was assembled, showing high sensitivity, linearity, wide response range and great durability in detecting complex human motions including speaking and various joint bending.
危险品化学品经营许可证（带存储）