【摘要】 为了减弱因巨大介电常数差异而引发的界面问题,将介电常数处于PMN-PT和PVDF之间的BT引入薄膜内部,形成过渡。制备具有核-壳结构的BT@dopa和PMN-PT@dopa颗粒,并将两者作为双组分填料共同引入PVDF基体中,制备具有高介电性能和储能效率的复合薄膜。研究结果表明:相对于单组分的BT@dopa/PVDF薄膜和PMN-PT@dopa/PVDF薄膜,由BT@dopa颗粒和PMN-PT@dopa颗粒与PVDF基体构成的双组分复合薄膜的介电性能和储能性能得到显著提高;在100 Hz时,BT@dopa+PMN-PT@dopa/PVDF体积分数为10%的双组分复合薄膜的介电常数为17.9,是BT@dopa/PVDF复合薄膜的1.77倍;当BT@dopa和PMN-PT@dopa体积分数为3%时,双组分复合薄膜击穿场强达到350 k V/mm,同时双组分复合薄膜储能密度达到10.01 J/cm~3,放电效率为50.5%。更多还原

【Abstract】 The transition formed inside the film by BT of dielectric constant between PMN-PT and PVDF was utilized to cope with the interface problems caused by the huge difference in dielectric constant. BT@dopa and PMN-PT@dopa with core-shell structure were prepared and were used as two-component fillers to be introduced into PVDF together to prepare high-quality composite films. The results show that BT@dopa+PMN-PT@dopa/PVDF two-component composite films are significantly improved in terms of dielectric properties and energy storage properties relative to one-components BT@dopa/PVDF and PMN-PT@dopa/PVDF. The dielectric constant of the 10%(volume fraction) BT@dopa+PMN-PT@dopa/PVDF two-component composite film is 17.9 at100 Hz, which is 1.77 times higher than that of the BT@dopa/PVDF composite film. Besides, the discharged energy density of composite films with 3%(volume fraction) BT@dopa and PMN-PT@dopa particles achieves 10.01 J/cm~3 at 350 kV/mm and maintains a high discharged efficiency of 50.5%.更多还原