摘要
以二维碳化钛基MXene作为填料,高弹性、具备优良力学性能的高分子材料聚氨酯(PU)作为基体,通过溶液共混法制备了具有高介电常数的MXene/PU复合材料,研究了MXene填充量对以PU为基体的复合材料介电性能的影响.结果表明,随着MXene填充量增大,MXene/PU复合材料的介电常数先上升后下降.当MXene的质量分数为 12%,频率 103 Hz时,MXene/PU介电常数达到最高值 44.8,是纯PU介电常数(6.9)的 6.49 倍,同时介电损耗仅为 0.76,仍然保持在较低的水平.当MXene的质量分数提升至 14%时,MXene/PU复合材料的介电常数降低,但介电损耗大幅升高.
Abstract
MXene/PU composites with high dielectric constant were prepared by solution blending using two-dimensional titanium carbide-based MXene as filler and polyurethane(PU)with high elasticity and excellent mechanical properties as the matrix.The effect of MXene filling amount on the dielectric properties of PU-based composites was studied.The results show that the dielectric constant of MXene/PU composites follows a change law of first rising and then decreasing with the increasing amount of MXene filling.When the mass fraction of MXene reaches 12%,the dielectric constant at 103 Hz reaches the highest,which is 44.8 and 6.49 times that of pure PU(6.9),while the dielectric loss is only 0.76,which still keeps at a low level.When the mass fraction of MXene increases to 14%,the dielectric constant of MXene/PU composites decreases,but the dielectric loss increases significantly.
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