Self-Recovering 3-Dimensional Micro Pore Structure Pressure Sensor Using Shape Memory Polymer

Shape memory polymer (SMP) is a polymer based on PU that has the property of restoring to its original shape at a specific temperature like a shape memory alloy. This ability could improve durability of sensors in cyclic loading. We fabricate a porous structured sensor having a self-recovery ability. This sensor shows good durability and sensitivity than other polyurethane porous structure. Also, the developed sensor is rapidly restored in 30 seconds in a 70 °C oven. We propose a self-recovering capacitive pressure sensor which has excellent durability. Furthermore, it works in the wide pressure range (∼400kPa) with good linearity.