PVA/EG conducting polymer hydrogels and its strain sensing properties
As an excellent material for flexible sensors,conductive hydrogels have broad prospects in the field of wearable devices.In this study,a series of PVA/EG conductive hydrogels with different mass ratios of PVA were prepared by mixing the hydrogel base polyvinyl alcohol(PVA)with ethylene glycol(EG).The structures and morphologies of 10％,20％,and 30％PVA/EG hydrogels were characterized,among which,the 20％PVA/EG hydrogel exhibited higher relative background intensity,crystalline content,and more surface pores.The sensing properties of the 20％PVA/EG conductive hydrogel,including sensitivity,linearity,response time,stability,and temperature reliability,were tested using a universal materials testing machine.The results showed that the sensitivity coefficient of the conductive hydrogel reached up to 0.74,the linear correlation coef-ficient reached 0.987,the response time was as low as 80 ms,and the relative resistance change remained rela-tively constant during 50 cycles of 15％stretching.Moreover,the hydrogel sample continued to function nor-mally at-20 ℃.Finally,the conductive hydrogel samples were attached to different parts of the body,such as fingers,spine,and feet,for motion experiments,validating the feasibility of the conductive hydrogel in various human motion monitoring scenarios.
万方数据
维普
