Polyurethane Electrospun Nanofiber Webs with Additives for Highly Sensitive and Low Hysteresis Piezocapacitive Sensor
발표자
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초록
내용
Electrospun TPU nanowebs have been used as piezocapacitive sensors which can be applied for monitoring static pressures. In our previous study, crosslinked TPU nanoweb-based sensors have been proposed in order to overcome the drawbacks of TPU sensor, but their applications are still restricted due to large hysteresis caused by insufficient crosslinking. Therefore, in this study novel polyurethane (PU) having chemical structure quite different from TPU was electrospun into nanofiber. Moreover, additives was added in PU dope solution to increase the sensitivity of sensor to pressure, which induced very large as well as linear change of capacitance with applied and released pressure. Hysteresis of the sensor was assessed through measuring the capacitance values during 20 cyclic loading and unloading and was improved significantly from 7.8% to 1.6%. Creep and stress relaxation behaviors were also tested.