Affiliation:
1. School of Electrics and Computer Engineering Nanfang College, Guangzhou Guangzhou 510970 China
2. College of Information Technology Jilin Engineering Research Center of Optoelectronic Materials and Devices Jilin Normal University Siping 136000 China
3. School of New Energy Science and Engineering Xinyu University Xinyu 338004 China
Abstract
AbstractConductive polymer hydrogels are vital in strain sensors, yet achieving high resilience and toughness is a challenge. This study employs a prestretch method to engineer a tough conductive polymer hydrogel with sufficient resilience. Initially, a blend film of polyvinylalcohol (PVA) and ethylene‐vinyl alcohol copolymer (EVOH) is prepared through solution casting, followed by a swelling process to form a PVA‐EVOH hydrogel. This hydrogel, with PVA crystallites as crosslinking points, exhibits high toughness. The hydrogel is then immersed in pyrrole and ferric chloride solutions for in‐situ polymerization of polypyrrole (PPy), creating a conductive PPy/PVA‐EVOH hydrogel. Finally, a 200% prestretch is applied, breaking short chains within the network, eliminating energy dissipation at low strains. This results in a hydrogel with a 100% elastic deformation range, while maintaining high fracture toughness (1700 J m‐2). The prestretched PPy/PVA‐EVOH hydrogel functions as a strain sensor with low hysteresis, providing consistent strain measurements during loading and unloading. This outperforms the non‐prestretched sample, which shows inconsistent responses between stretching and releasing.
Subject
Materials Chemistry,Polymers and Plastics,Organic Chemistry