螺旋型非晶态碳纳米管/双马来酰亚胺树脂(HACNT/BMI)复合材料的制备及吸波机理  

Preparation and Electromagnetic Wave Absorbing Mechanism of Helical Amorphous Carbon Nanotube/Bismaleimide(HACNT/BMI)Resin Composites

作　　者：朱若星 赵廷凯[2] 折胜飞 李铁虎[2] ZHU Ruoxing;ZHAO Tingkai;SHE Shengfei;LI Tiehu(Library of Northwestern Polytechnical University,Xi an 710072,China;School of Materials Science and Engineering,Northwestern Polytechnical University,Xi an 710072,China;State Key Laboratory of Transient Optics and Photonics,Xi an Institute of Optics and Precision Mechanics,Chinese Academy of Science,Xi an 710119,China)

机构地区：[1]西北工业大学图书馆,西安710072 [2]西北工业大学材料学院,西安710072 [3]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,西安710119

出　　处：《材料导报》2021年第10期10216-10220,共5页Materials Reports

摘　　要：新型电磁波吸收材料是国防科技中的研究热点和重点,碳材料作为一种轻质吸波材料受到研究者们的广泛重视。本研究利用浮动催化化学气相沉积法制备螺旋非晶碳纳米管,以螺旋非晶碳纳米管作为吸波剂,双马来酰亚胺树脂作为基体制备了螺旋非晶碳纳米管/双马来酰亚胺树脂吸波复合材料。采用扫描电子显微镜、透射电子显微镜、X射线衍射仪和拉曼光谱仪等设备对样品进行微观形貌和结构表征,通过矢量网络分析仪测试其电磁参数。实验结果表明,吸波剂含量的增加增强了螺旋非晶碳纳米管/双马来酰亚胺树脂复合材料的吸波性能,其最大吸收峰值可达-18.35 dB,最大吸波频宽(<-10 dB)为2.56 GHz(9.52~12.08 GHz),反射损耗超过97%,且吸收峰向低频方向移动。螺旋非晶碳纳米管因其特殊的螺旋型结构极大地增加了电磁波反射概率和散射波程,增大了入射电磁波能量损耗。New electromagnetic wave absorbing materials are the hotspot and focus of research in national defense science and technology.Carbonmaterials,as light absorbing materials,have been widely valued by researchers.In this study,we prepared helical amorphous carbon nanotube/bismaleimide(HACNT/BMI)resin composites and investigated their electromagnetic wave absorbing properties.We used helical amorphous carbon nanotubes as adsorbing agents,bismaleimide as matrix to prepare HACNT/BMI resin composites.Helical amorphous carbon nanotubes were prepared by floating catalytic chemical vapor deposition method.Scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffractometer(XRD)and Raman spectroscopy were used to characterize the morphology and structure of samples.The electromagnetic parameters of HACNT/BMI composites were measured by vector network analyzer.The results showed that the increasing in the content of absorbing agent enhanced the electromagnetic wave absorbing properties of HACNT/BMI composites.The maximum absorption peak reached-18.35 dB,the widest absorbing bandwidth reached 2.56 GHz(9.52~12.08 GHz)when the R L belows-10 dB,and the reflection loss exceeded 97%.Moreover,the absorption peak of HACNT/BMI composites with higher content of HACNTs shifted towards lower frequency compared to that of the sample with lower content of HACNTs.Our results indicate that the helical structures of HACNTs plays an important role in enhancing the electromagnetic wave absorbing performance of HACNT/BMI composites.The HACNTs could increase the possibility of multiple reflection of electromagnetic wave and the path length of scattered waves.As a result,the energy loss of incident electromagnetic wave was increased.

关 键 词：螺旋非晶碳纳米管 双马来酰亚胺树脂 复合材料 吸波性能 吸波机理 

分 类 号：TB34[一般工业技术—材料科学与工程]