Preparation and Properties of Poly(vinyl alcohol)/polypyrrole Composite Conductive Hydrogel Strain Sensor

PVA/PA/NP hydrogel was prepared via freeze-thaw cycle method using poly(vinyl alcohol)(PVA) as raw material,phytic acid(PA)and amino-polyhedral oligomeric silsesquioxane(NH2-POSS,NP)as crosslinking agents. Then,PVA/PA/NP-PPy composite conductive hydrogel was prepared by in.situ polymerization of pyrrole,which overcomed the fragile and hydrophobic characteristics of polypyrrole materials,and further improved the conductivity and sensitivity of hydrogels. The cyclic tensile curve prove that the hydrogel has good self-recovery ability,the conductivity is as high as 7.53 S/m. It can be seen from the I-V curves that the highest detection current of the hydrogel as a flexible strain sensor can reach 9.029 mA and the gauge factor can reach 6.796. The results show that it can accurately monitor many kinds of tiny movements of human body through the change of current signal.