十六烷基三甲基溴化铵修饰的 MXene/聚酰亚胺纳米复合材料具有增强的介电性能、热稳定性和防潮性,Journal of Applied Polymer Science

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十六烷基三甲基溴化铵修饰的 MXene/聚酰亚胺纳米复合材料具有增强的介电性能、热稳定性和防潮性
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-09-22 , DOI: 10.1002/app.53142
Xianwu Cao ₁ , Chonghao Lu ₁ , Wanjing Zhao ₁ , Yizhang Tong ₁ , Guangjian He ₁ , Xinliang Zou ₁ , Yanhong Feng ₁ , Zhitao Yang ₁

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在极端条件下，聚合物介电材料有望具有良好的介电性能和耐热性。聚酰亚胺（PI）具有较高的使用温度（>250°C）和低介电损耗，但其低介电常数限制了其进一步应用。MXene的加入可以显着提高PI的介电常数，但MXene与弱极性基体的相容性较差，导致热亚胺化过程中的Bénard-Marangoni（BM）不稳定。这个问题可以通过 MXene 的表面改性来解决。因此，在这项工作中，通过原位聚合制备了一种新型十六烷基三甲基溴化铵（CTAB）修饰的MXene/PI纳米复合薄膜。添加 7 wt% MXene@CTAB 后，PI 纳米复合材料的介电常数（k = 7.8 at 100 Hz)，由于形成微电容器结构和 Maxwell-Wagner-Sillars (MWS) 界面极化，是纯 PI 的 2.4 倍。其介电损耗保持在超低水平（100 Hz 时为 0.027），而 7 wt% MXene/PI 纳米复合材料的介电损耗为 3.027。这是由于 CTAB 抑制了 MXene 的团聚。此外，MXene@CTAB/PI 复合材料具有优异的热稳定性、良好的疏水性和低吸水性。上述特性确保了 MXene@CTAB/PI 复合材料在各种极端情况下的广泛应用。

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Cetyltrimethylammonium bromide decorated MXene/polyimide nanocomposites with enhanced dielectric properties, thermostability, and moisture resistance

Under extreme conditions, the polymer dielectric materials are expected to have good dielectric properties and heat resistance. Polyimide (PI) has high service temperature (>250°C) and low dielectric loss, but its low dielectric constant limits its further application. The addition of MXene can significantly improve the dielectric constant of PI, but the poor compatibility between MXene and weak polar matrix leads to Bénard-Marangoni (BM) instability in the process of thermal imidization. This issue can be solved by the surface modification of MXene. Therefore, in this work, a new cetyltrimethylammonium bromide (CTAB) decorated MXene/PI nanocomposite film was prepared by in-situ polymerization. With the addition of 7 wt% MXene@CTAB, the PI nanocomposite shows improved dielectric constant (k = 7.8 at 100 Hz), which is 2.4 times that of pure PI due to the formation of micro-capacitors structure and Maxwell-Wagner-Sillars (MWS) interfacial polarization. Its dielectric loss keeps at an ultra-low level (0.027 at 100 Hz) while that of 7 wt% MXene/PI nanocomposite is 3.027. It is owing that CTAB inhibits the agglomeration of MXene. In addition, MXene@CTAB/PI composites have excellent thermal stability, good hydrophobicity, and low water absorption. The above properties ensure MXene@CTAB/PI composites wide application in various extreme situations.

更新日期：2022-09-22

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