铁氧体复合材料吸波性能研究进展

介绍了铁氧体吸波材料的概况。重点总结了近年来铁氧体复合材料的研究现状和吸波性能。详细介绍了聚苯胺/铁氧体复合材料、环氧树脂/铁氧体复合材料以及铁氧体与其它导电聚合物的复合材料的吸波性能,这些复合材料将是今后吸波材料研究和发展的重要方向。针对未来发展提出了建议。     

纳米吸波材料的研究现状与发展趋势

评述了纳米吸波材料的特性及吸波原理,介绍了纳米铁氧体吸波材料、纳米金属吸波材料、纳米陶瓷吸波材料、纳米导电高分子吸波复合材料、碳纳米管吸波材料、纳米复合吸波材料研究现状及发展情况,指出了纳米复合吸波材料是未来纳米吸波材料的研究重点。     

微纳米吸波材料研究现状

介绍了微纳米吸波材料的吸波机理,叙述了铁氧体吸波材料、金属微粉吸波材料、多晶铁纤维吸波材料等常用吸波材料的特点与研究进展;着重分析了纳米材料的特点以及其作为吸波材料的独特性能,并简要介绍了具有独特性能的左手材料以及碳纳米管作为吸波材料的研究现状,在此基础上对吸波材料的研究前景进行展望.     

碳纳米管/聚合物复合吸波材料的研究进展

简要介绍了吸波材料研究的重要性,综述了碳纳米管/聚合物吸波材料的研究现状,主要包括碳纳米管/环氧树脂(ER)复合材料、碳纳米管/聚苯胺(PANI)复合材料以及碳纳米管/聚氯乙烯(PVC)复合材料的制备方法和吸波性能;并展望了碳纳米管/聚合物复合材料在航天工业领域的发展方向.     

无机吸波材料研究进展

本文论述了无机吸波材料种类、吸波原理和研究进展.重点对铁氧体、金属微粉、碳纳米管、碳纤维、纳米氧化物和陶瓷等吸波材料的研究进展进行了分析和讨论,并指出了吸波材料今后的研究重点和发展方向.     

铁氧体磁性材料的吸波机理及改善吸波性能的研究进展

铁氧体吸波材料具有吸收频段宽、吸收率高、匹配厚度薄等优点,但由于存在密度大、频带较窄、高温特性差等问题,难以满足吸波材料“薄、轻、宽”的特性,限制了铁氧体吸波材料的应用。本文介绍了吸波材料的吸波机理及铁氧体吸波材料的研究进展,结合近几年铁氧体吸波材料的的发展现状,概述了改善铁氧体吸波材料吸波性能的方法,进而展望了吸波材料的发展前景。总结得出对铁氧体吸波材料进行纳米化、复合化、掺杂及改变形貌,进一步研究和开发出性能优良的吸波材料并将其应用到工业化生产中,是未来制备高性能吸波材料的发展方向。     

吸波涂层材料的研究进展

吸波材料在军事和民用领域具有非常重要的意义,而提高吸波材料性能的关键是提升吸收剂的电磁性能和优化吸波材料的制备工艺。在讨论吸波材料的吸波原理之后,详细介绍了铁氧体、高温吸波材料、纳米吸波材料、复合吸波材料及导电高分子吸波材料这五种吸波涂层材料的最新研究进展,并分析各种涂层的主要特点,最后指出吸波材料向纳米化、复合化、性能可调的方向发展。     

磁性吸附碳纳米管复合材料在吸波材料中的应用及展望

总结了近年来磁性金属或合金/碳纳米管复合材料在雷达波吸波材料中的应用及发展现状,并介绍了碳纳米管的磁性吸附对吸波性能的影响,最后对碳纳米管在吸波材料中的应用作出展望。     

碳纳米管在聚合物基吸波复合材料中的应用

碳纳米管作为一种新型电磁吸波剂,因其独特的物理和化学性能引起了人们极大的关注。本文简述了碳纳米管的吸波机理及吸波性能的表征,重点介绍了碳纳米管在聚合物吸波复合材料中的应用,如碳纳米管/树脂基复合材料、碳纳米管/导电高聚物复合材料、碳纳米管/橡胶基复合材料,最后展望了吸波材料的发展方向。     

柔性橡胶吸波材料的研究进展

概述柔性橡胶吸波材料吸波基本原理,重点介绍铁氧体系橡胶吸波材料、金属铁微粉系橡胶吸波材料、碳系橡胶吸波材料以及多层橡胶吸波材料的研究状况。目前橡胶吸波材料的探索大多局限于实验室研究,橡胶吸波材料还未能成熟地进行工业化生产和应用,需要进一步探讨高温、低温、振动冲击等环境因素以及硫化体系和混炼工艺对橡胶吸波材料吸波性能的影响,开发能够吸收特定波长的橡胶吸波材料。     

羰基铁粉/锶铁氧体/MVQ吸波复合材料的制备与性能研究

以羰基铁粉与锶铁氧体为吸波填料制备羰基铁粉/锶铁氧体/甲基乙烯基硅橡胶(MVQ)吸波复合材料,研究羰基铁粉/锶铁氧体并用比对羰基铁粉/锶铁氧体/MVQ吸波复合材料性能的影响。结果表明,羰基铁粉/锶铁氧体/MVQ复合材料吸波峰处于羰基铁粉/MVQ和锶铁氧体/MVQ复合材料之间,在填料总体积分数不变的前提下,随着羰基铁粉用量的减小,复合材料吸波峰小于-10 dB的带宽先增大后减小、吸波峰向高频方向移动、拉伸强度和拉断伸长率变化不大、压缩永久变形减小、动态性能提高。     

碳纳米管/环氧树脂复合纤维棉宏量制备及其吸油性能

采用环氧树脂作为前驱体溶胶,利用负载有碳纳米管的铝板为接收基板,通过简单方便的静电纺丝协同拉拔技术,宏量制备了碳纳米管/环氧树脂复合纤维棉,并对这种复合纤维棉的吸油性能进行了探索。采用扫描电子显微镜(SEM)、热重分析仪(TGA)、压汞仪、拉曼光谱仪等设备系统分析了复合纤维棉的形貌、结构和组成。结果表明,复合纤维棉具有高的比表面积与孔隙率,碳纳米管均匀地分布在复合纤维棉中。复合纤维棉与水和植物油的接触角分别为114.1°与66.8°;与丙纶纤维相比较,复合纤维棉展现出更加优异的吸油能力,可吸附超过自身质量10倍的油类物质。     

羧基化多壁碳纳米管对T-1000碳纤维/环氧树脂复合材料性能的影响

对多壁碳纳米管进行了表面羧基化处理,将羧基化碳纳米管添加到环氧树脂基体中,通过湿法缠绕工艺制备出具有高性能的T1000碳纤维增强环氧树脂复合材料。结果表明,复合材料的界面性能和耐热性能得到改善,当羧基化碳纳米管质量含量为1％时,复合材料的层间剪切强度提高了近29％。     

Interlaminar fracture toughness of woven fabric composite laminates with carbon nanotube/epoxy interleaf films

The Mode I interlaminar fracture behavior of woven carbon fiber/epoxy composite laminates incorporating partially cured carbon nanotube/epoxy composite films has been investigated. Laminates with films containing carbon nanotubes (CNTs) in the as‐received state and functionalized with polyamidoamine were evaluated, as well as laminates with neat epoxy films. Double‐cantilever beam (DCB) specimens were used to measure G_Ic, the critical strain energy release rate (fracture toughness) versus crack length. Post‐fracture microscopic inspection of the fracture surfaces was performed. Results show that initial fracture toughness was improved with the amino‐functionalized CNT/epoxy interleaf films, but the important factor appears to be the polyamidoamine functionalization, not the CNTs. The initial fracture toughness remained relatively unaffected with the incorporation of neat epoxy and as‐received CNT/epoxy interleaf films. Plateau fracture toughness was unchanged with the use of functionalized CNT/epoxy interleaf films, and was reduced with the use of neat epoxy and as‐received CNT/epoxy interleaf films. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

多壁碳纳米管／环氧树脂复合材料性能研究

采用物理机械方法与化学方法相结合的手段,制备了多壁碳纳米管（MWNTS）／环氧树脂（Epoxy）复合材料。通过力学拉伸试验测试了MWNTs/Epoxy复合材料拉伸强度和拉伸模量与MWNTS添加量的关系,利用扫描电镜（SEM）分析了MWNTS／Epoxy复合材料的拉伸断面,并用表面电阻测试仪对所制备的碳纳米管复合材料进行了电学性能测试。结果表明：经过化学酸化的方法处理后的MWNTS在复合材料中的分散得到了改善,力学性能也得到了明显的提高,但酸处理后的复合材料的电学性能明显低于未处理的复合材料。     

改性碳纳米管增强环氧树脂力学性能研究进展

具有低密度、高强度和高模量等优异力学性能的碳纳米管(CNTs)是环氧树脂(EP)基体的理想增强材料,然而CNTs在EP基体中分散性较差,并且其与EP之间难以形成有效的结合界面,这成为制约CNTs/EP复合材料力学性能进一步增强的关键因素,对CNTs进行官能化改性则是解决上述问题的有效途径之一。从增强EP力学性能方面介绍了CNTs的羧基化、胺基化和硅烷化等官能团化改性方法的研究应用进展,总结了其改性机理,结合该领域研究中的一些不足以及实际应用的需求,指出了进一步的研究方向。     

Flammability and thermal properties of epoxy/glass/MWNT Composites

The aim f this work is to study the effect of nanotubes on flammability properties of epoxy/glass composites. Multiwalled carbon nanotubes (MWNT) and its functionalized derivative (amino functionalized nanotubes) were incorporated into epoxy resin. To disperse MWNTs in the epoxy resin, different ways were employed. Microscopic observations showed that, the best dispersion state was gained by using ultrasonication method and high shear flow simultaneously. Thermal resistance of cured epoxy resins containing various amounts of nanotubes (0.25–0.7 wt %), was investigated by thermo gravimetric analysis (TGA). Introducing MWNTs and amino‐MWNTs to samples increased the initial thermal decomposition temperature for about 32 and 37°C, respectively. LOI measurements of composite samples showed an increase up to 32. Cone calorimetry test was carried out on epoxy/glass and epoxy/glass containing 0.5% MWNT. The results showed that, introducing 0.5% MWNTs decreases maximum average rate of heat emission for about 26%. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39849.     

Preparation and properties of polyimide/carbon nanotube composite films with electromagnetic wave absorption performance

The polyimide (PI)/carbon nanotube (CNT) films including 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA), p-phenylenediamine (p-PDA), and CNTs were prepared, which have prominent electromagnetic (EM) wave absorption performance. Experimental analyses of the mechanical properties, thermal stabilities, coefficient of thermal expansion (CTE), the glass transition temperature (T_g), and EM parameter revealed the beneficial effects of the CNTs on the resulting composite films. In particular, when the content of CNTs is 6 wt%, the film shows the highest EM wave absorption performance, which exhibits the effective absorption bandwidth of 2.72 GHz with the matching thickness of only 2.0 mm. These results indicate that PI-based films have a certain potential application in the area of EM wave-absorbing materials.     

高温微波功能复合材料研究进展

介绍了微波功能复合材料的应用环境与发展;论述了透波和吸波材料的性能要求;重点叙述了两种高温材料的国内外研究现状;并详细描述了智能复合材料的结构,在此基础上,探讨了微波功能复合材料的应用前景和发展方向.     

Carbon Nanotube/Carbon Fiber Multiscale Composite: Influence of Interfacial Strength on Mechanical Properties

A promising study to gain the multiscale composite by the growth of carbon nanotubes on the fibers for intralaminar and interlaminar reinforcement was carried out. The mathematical modeling and the numerical simulation of the mechanical response are helpful for the optimum design of the multiscale composite. In this paper, a multiscale modeling approach using a commercial package ANSYS was used to simulate the mechanical response of the complicated material systems. The behavior of two types of interfaces (carbon nanotube/epoxy resin, carbon fiber/equivalent matrix) was described using a cohesive zone model, and the mechanical properties of the multiscale composite were predicted accurately. The mechanism of intralaminar reinforcement was then analyzed numerically. The results reveal that the matrix-dominated properties of the multiscale composite, such as the transverse elastic modulus, increase with the increase of the carbon nanotube/epoxy resin interfacial strength.