Aiming at the problem that it is difficult to balance the conductive and mechanical properties of flexible strain sensors

a type of flexible strain sensor based on poly(vinyl alcohol)-co-acrylamide(PVA-co-AAm)double-network conductive hydrogel is prepared by photo-crosslinking and freeze-thawing treatments.The mechanical properties of the hydrogel are significantly improved by the construction of the double-network structure

and its low modulus enables it to respond rapidly to small strains on human skin (response time:96ms)

when used in flexible strain sensors and it can generate various response signals according to different motion postures

and its sensitivity to high-intensity pressure is

up to 45.3s

-1

.These performances show that the flexible strain sensor has good application prospects in human posture monitoring and interaction recognition scenarios.