Preparation of CMC/P(AA-AMPS)-Fe3+conductive hydrogel and its application in strain sensors
An electrically conductive hydrogel of carboxymethyl cellulose/poly[acrylic acid-co-(2-acrylamido-2-methylpropane sulfonic acid)][CMC/P(AA-AMPS)-Fe3+]crosslinked with iron ions was prepared through a one-pot method.The influence of CMC and AMPS content on the mechanical properties of the hydrogel was investigated.Additionally,the self-recovery performance and strain sensing properties of the hydrogel were tested using a universal tensile testing machine and a digital multimeter.Results show that the CMC/P(AA-AMPS)-Fe3+conductive hydrogel exhibits the optimal overall mechanical properties when the mass fraction of CMC is 1.5%and that of AMPS is 1.5%.At this composition,the hydrogel demonstrated a fracture strength of 171 kPa and fracture elongation of 398%.With strains ranging from 0%to 400%,the gauge factor of the CMC/P(AA-AMPS)-Fe3+conductive hydrogel reaches 3.55.Utilizing the CMC/P(AA-AMPS)-Fe3+conductive hydrogel as a base,the strain sensor accurately detects strains from 0%to 500%,enabling monitoring of various human movements while maintaining excellent cyclic stability.
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