Jinhuan Li*, Mengqi Huang, Wentao Gao, Kai Yao and Hongfang Ma,
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引用次数: 0
摘要
石墨烯/聚酰亚胺复合气凝胶（GPIs）是通过一锅溶热法制备的，然后在 350 °C 下进行热处理，得到 GPIs (350)。GPIs (350) 具有显著的电磁波吸收特性。具体来说，厚度为 3.75 mm 时，最小反射损耗可达 -75.90 dB；厚度为 2.70 mm 时，有效吸收带宽可达 6.44 GHz。GPIs (350) 吸收体中氧化石墨烯的实际用量低至 3 wt %，显示出很高的电磁波吸收效率。值得注意的是，GPIs (350) 还具有出色的热稳定性，温度可达 415 ℃。聚酰亚胺被证明可调节电磁特性，并提供大量石墨烯-聚酰亚胺界面。石墨烯和聚酰亚胺的成分、三维形貌和后热处理的完美匹配保证了其优异的综合电磁波吸收特性。本研究为通过调整工程聚合物来制造具有优异性能的电磁波吸收材料提供了一种更为简便有效的方法。
Graphene/Polyimide Composite Aerogels for Superior Electromagnetic-Wave-Absorbing Materials with High Thermal Stability and Absorption Effectiveness
Graphene/polyimide composite aerogels (GPIs) were fabricated through a one-pot solvothermal method and then underwent heat treatment at 350 °C to obtain GPIs (350). GPIs (350) exhibits prominent electromagnetic-wave-absorbing properties. Specifically, the minimum reflection loss can reach −75.90 dB with a thickness of 3.75 mm, and the effective absorption bandwidth reaches 6.44 GHz with a thickness of 2.70 mm. The actual dosage of graphene oxide in the GPIs (350) absorbers is low to 3 wt %, showing high effectiveness in absorbing electromagnetic waves. Notably, GPIs (350) also displays excellent thermal stability up to 415 °C. Polyimide is proven to tune the electromagnetic properties and provide much graphene–polyimide interface. The composition of graphene and polyimide, the three-dimensional morphology, and post-heat treatment are the perfect match to guarantee excellent comprehensive electromagnetic wave absorption properties. The present work provides a much more facile and effective approach to fabricating electromagnetic-wave-absorbing materials with exceptional properties through tuning engineering polymers.
期刊介绍：
ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers.
The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.
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