碳化钛的镍化以及对复合材料吸波性能的影响
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四川大学高分子研究所郭少云课题组

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Nickelization of Titanium Carbide and Its Impact on the Microwave Absorption Properties of Composite Materials
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    摘要:

    二维金属碳化物(MXene),以二碳化三钛(Ti3C2TX)为代表,优异的介电性能使其在电磁波吸收领域具有很大的应用潜力。然而,其较高的电导率与单一的介电损耗机制限制了其微波吸收性能的进一步提高。水性聚氨酯(WPU)具有绿色环保、良好的机械性等优点被广泛应用于各种领域。因此,本文通过溶剂热法,制备了磁性镍颗粒修饰的MXene吸波剂(Ni@MXene)。目的是为了改善MXene的匹配特性并引入磁损耗机制,从而提高MXene的吸波性能。通过调控镍离子与MXene的质量比制备了三种不同镍含量的Ni@MXene。结果表明,镍的引入能够有效地改善MXene的匹配特性并显著提高了MXene的吸波性能。Ni@MXene/石蜡复合材料在40wt%,1.7mm厚度下最小反射损耗为-32.0dB(对应频率为11.9GHz),有效吸收带宽能够达到2.6GHz(对应波段为11.7-14.3GHz)。最后,以MXene和Ni@MXene为填料,WPU为基体制备质量分数为20%的复合材料,进一步验证了镍化改性对MXene吸波性能的提升。

    Abstract:

    Two-dimensional metal carbide (MXene), represented by titanium bicarbonide (Ti3C2TX), has great application potential in the field of electromagnetic wave absorbing materials due to its excellent dielectric properties. However, its high conductivity and single dielectric loss mechanism limits the further improvement of its microwave absorption performance. Waterborne polyurethane (WPU) has been widely used in various fields due to its advantages of environmental protection and excellent mechanical properties. Therefore, the magnetic nickel particle modified MXene absorber (Ni@MXene) was prepared by solvothermal method in this paper. The purpose is to improve the matching characteristics of MXene and introduce magnetic loss mechanism, thereby improving the wave-absorbing performance of MXene. Three kinds of Ni@MXene with different nickel contents were prepared by adjusting the mass ratio of nickel ion to MXene. The results show that the introduction of nickel can effectively improve the matching characteristics of MXene and significantly enhance the wave-absorbing properties of MXene. The Ni@MXene/paraffin composite showing the minimum reflection loss (RL) of -32.07dB(at 11.90GHz) and the effective absorption bandwidth (EAB) can reach 2.63GHz (from 11.70 to 14.33GHz) with fillers loading of 40 wt% and a thickness of only 1.7 mm. Finally, the composite with 20wt% was prepared by using MXene and Ni@MXene as filler and WPU as matrix, which further verified the improvement of the absorption performance of MXene by nickelization modification.

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  • 收稿日期:2022-03-30
  • 最后修改日期:2022-05-24
  • 录用日期:2022-06-14
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