改性炭黑/热塑性聚氨酯导电柔性复合膜制备及性能OA

To develop high-performance flexible sensors,carbon black(CB)was surface-modified with the silane coupling agent KH-550 and subsequently compounded with thermoplastic polyure-thane(TPU)via physical blending to fabricate m-CB/TPU conductive composite films.The re-sults demonstrate that the surface modification significantly improves the dispersion of the filler within the polymer matrix.When the mass fraction of m-CB reaches 25%,the composite film at-tains its percolation threshold,accompanied by an effective enhancement in electrothermal conver-sion performance.At a 30%m-CB mass fraction,the film exhibits optimal comprehensive sensing properties,featuring a broad pressure response range of 0-200 N and a rapid response time of 2.8 s.Moreover,it demonstrates excellent stability with signal fluctuations of less than 5%dur-ing a continuous 500 s test.Additionally,the film displays outstanding electroactive shape memo-ry performance,maintaining a shape recovery rate of 77%even after 5 cycles.In conclusion,the prepared m-CB/TPU composite films exhibit tremendous application potential in flexible sensing fields,particularly for smart wearable devices.