To solve the problems of complicated preparation process and poor intrinsic stretchability of existing stretchable electrodes,this study employs a simple in situ polymerization method and optimizes the dopant to develop a conducting polypyrrole-based fiber with excellent intrinsic stretchability.Sodium salicylate is utilized as both a dopant and a plasticizer during the fabrication process,resulting in a highly conductive fiber with an initial conductivity of 6.34 S/cm,which remains at 5.37 S/cm even under 100％strain.Furthermore,the elastic conductive fiber-based heater exhibits excellent Joule heating performance.When a 5 V voltage is applied,the surface temperature can reach 60 ℃,providing reliable heating effects for thermotherapy.Moreover,when integrating the conductive fibers into electric heating gloves,experimental results show that the surface temperature of the gloves only decreases by 4.89％during finger joint movements,enabling stable thermotherapy for moving joints.This provides a convenient and effective implementation for the physical treatment of conditions such as Raynaud's syndrome and joint injury pain.
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