This paper reports the development of a highly stretchable slide-ring supramolecular hydrogel for flexible electronic devices. The hydrogel, constructed using hydroxypropyl-modified α-cyclodextrin (Hy-α-CD) and acrylamide-PEG20000-acrylamide (ACA-PEG20000-ACA), can be stretched to 25.4 times its original length and rapidly recovers its shape. The addition of Ca²⁺ ions enhances its ionic conductivity, making it suitable for wearable strain sensors that monitor human motion.
