Development of High Force Capacity Electrochemical Adhesive Based on Sulfonate Containing Polyelectrolytes
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초록
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Electrochemical adhesives can simply switch attachment force by an electric field through chemical reaction at electrode-polymer interface. After electro-programming, the polymer can retain its adhesion without any external power source. This broadens the use of electroadhesives to long-term supporting devices that consumes minimal electricity, unlike conventional devices needing consistent power supply to maintain adhesion. In this research, we demonstrate a new electrochemical low voltage (~ 5 V) operating adhesion device using sulfonate containing polyelectrolyte. At forward bias, sulfonic (-) groups bind to the electrode surface (+), inducing strong adhesive force. Conversely, at reverse bias, interfacial crack propagates due to polymer-electrode repulsion, triggering detachment. With this working mechanism, we introduce PFSA ionomer with high mechanical property as a polymeric adhesive to maximize performance achieving 14 N of force capacity with 2 months of adhesion retention.