부산대학교 도서관

The demand for wearable electronics is increasing. For measurements at human joints elongation sensors are necessary, which are skin compatible and use non toxic materials. We propose novel sensors based on SBS-CTPU filaments and investigated them under strain and temperature changes. The filaments are melt extruded by mixing SBS (Styrene-Butadiene-Styrene) and CTPU (Conductive Thermoplastic Urethane) pellets using a custom extruder machine in a ratio to achieve the percolation threshold for strain sensing. In the testing phase, a maximum elongation of 2.5% was applied to investigate the behavior of the sensor. Environmental influence in terms of temperature on the elongation sensors was also experimentally investigated in the temperature range from 30°C to 60°C. The filaments show a temperature sensitivity following a NTC behavior.