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Multibond-synergized cysteine aggregates crosslinked ionogels with mechanically adaptive properties for robust ionic
Guge Niku1, Yinpeng Chen1, Meiyi He1
1College of Chemistry and Engineering, Sichuan University of Science and Engineering, Zigong 643000, PR China; Organic Fluorine Material Key Laboratory of Sichuan Province, Zigong 643000, PR China.
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Conventional ionogels face irreconcilable trade-offs between mechanical robustness, toughness, and recoverability, limiting their utility in ionic skins. Inspired by collagen's hierarchical bonding, we develop L-cysteine-derived multibond-synergized cysteine aggregates (MSCA) with dual amide/disulfide linkages as dynamic crosslinkers in poly (2,2,3,3,4,4-Hexafluorobutyl acrylate-co-acrylamide) (P (HFBA-co-AAm)) ionogel. The resulting ionogels achieve breakthrough properties: 7.47 MPa tensile strength, 29.6 kJ/m2 fracture energy, and 93 % cyclic recovery via thermal-activated bond reformation (80 °C/20 min). These materials concurrently demonstrate medical-grade strain sensing (GF = 7.82@0-5 %, <4.6 % signal drift over 1000 cycles), rapid shape-memory (35 s recovery at 80 °C), high shape fixity (95.24 %), recovery rates (95.34 %), and water resistance (1.8 % swelling after 20 h). Validated in continuous pulse monitoring and joint motion tracking, this design overcomes critical limitations in durable wearable sensing.
