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。     

环氧树脂/石墨烯/多壁碳纳米管复合材料力学性能研究

以环氧树脂(EP)为基体、石墨烯(GNP)和多壁碳纳米管(MWCNT)为增强材料制备了EP/GNP/MWCNT纳米复合材料,通过拉伸试验考察了GNP与MWCNT的混合比例对复合材料力学性能的影响。结果表明:当GNP与MWCNT的总添加量为0.3%、混合比例为50:50时,EP/GNP/MWCNT纳米复合材料的综合力学性能达到最佳,此时复合材料的弹性模量、拉伸屈服强度、拉伸断裂强度、破坏应变等均达到或接近最大值。     

多壁碳纳米管/环氧树脂纳米复合材料的固化动力学研究

采用熔融混合法向低粘度的环氧树脂中添加适量的多壁碳纳米管,制备新型纳米复合材料,并采用傅里叶变换红外光谱仪(FT-IR)测试转化率,采用差示扫描量热法(DSC)研究多壁碳纳米管/环氧树脂复合体系的固化动力学,并对纳米复合材料的力学性能进行研究。结果表明:多壁碳纳米管加入环氧树脂复合体系后,对固化反应有催化作用,固化反应速率增大,转化率提高,而复合体系的力学性能却有所下降,玻璃化转变温度变化不大。     

多壁碳纳米管在国产碳纤维增强环氧树脂复合材料中应用

研究了一种简易有效的多壁碳纳米管(MWNTs)分散入环氧树脂的方法,对树脂的工艺性进行试验研究;使用碳纤维复丝的力学性能来表征纤维/树脂界面性能和纤维强度转化效果,制备了含MWNTs的环氧树脂/碳纤维预浸料,并对使用此预浸料制备的复合材料单向板进行力学性能测试。结果表明,当MWNTs的用量为E–51的0.5%时,二者混合球磨8 h后配制的树脂溶液适用期大于24 h,黏度小于0.8 Pa·s,树脂浇铸体拉伸强度78 MPa,弯曲强度106 MPa,断裂伸长率4.3%;添加MWNTs之后纤维/树脂结合良好,复合材料单向板拉伸强度提升了7.2%,弯曲强度提升了9.73%,压缩强度提升了6.82%,层剪强度提升了11.54%。     

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％。     

环氧树脂/多壁碳纳米管导电复合材料研究

采用不同氧化性的酸对多壁碳纳米管(MWNTs)进行处理,制备了环氧树脂(EP)/MWNTs导电复合材料.研究表明,少量的MWNTs就能使EP的导电性能有很大的提高;HNO3>酸化处理不仅可在MWNTs表面引入活性基团并将MWNTs截短到合适的长度,改善其在树脂中的分散性,而且能有效去除非晶碳杂质,提高MWNTs的导电性,使EP/MWNTs复合材料的导电性能最好,渗流阈值只有0.5%左右;未处理的MWNTs在EP中的分散性较差,复合材料的渗流阈值为1.3%左右;而经混酸酸化处理的MWNTs中存在许多缺陷,且MWNTs的长度变得太短,复合材料的导电性能最差,渗流阈值为1.6%左右.     

多壁碳纳米管/聚苯硫醚管复合材料的电磁性能

采用熔融共混法制备了多壁碳纳米管/聚苯硫醚复合材料,研究了在0.5~18 GHz频段,不同碳纳米管含量对复合材料电磁性能的影响。结果表明,介电常数实部与虚部随着碳纳米管含量的增加而增大, 介电常数实部在测量范围内随频率的增加而减小, 具有明显的频响特性;复合材料的磁导率随多壁碳纳米管含量的增加变化不明显, 呈弱磁性;通过对复合材料反射衰减的计算发现,当吸收层匹配厚度为2 mm 时,复合材料在0.5~18 GHz频段具有较好的微波吸收性能;当碳纳米管含量为7 %（质量分数,下同）时,反射衰减最大达- 31.5 dB ,反射衰减小于- 10 dB的频宽为2.2 GHz。     

环氧树脂/碳纳米管纳米复合材料的制备与性能研究进展

综述了碳纳米管的基本性质和环氧树脂／碳纳米管纳米复合材料的制备方法及其力学性能、热性能、电性能、流变性能和摩擦性能。讨论了不同碳纳米管的制备方法、碳纳米管的类型、碳纳米管的表面处理等因素对复合材料性能的影响。指出了目前环氧树脂／碳纳米管复合材料研究中存在的问题,最后展望了这种高性能复合材料的发展前景。     

环氧树脂/碳纳米管复合材料制备及导电性能研究进展

简要介绍了环氧树脂/碳纳米管复合材料的组成以及碳纳米管在环氧树脂中的分散方法;综述了环氧树脂/碳纳米管复合材料的制备方法,包括溶液浇铸法、原位聚合法、化学改性法、混合固化剂辅助叠层法和树脂传递模塑法;总结了国内外对环氧树脂/碳纳米管复合材料导电性能的研究现状,并分析了影响其导电性能的因素,包括碳纳米管的比表面积、表面功能化和制备方法,剪切速率及固化条件等。     

酸化多壁碳纳米管/水性聚氨酯复合材料的制备与性能研究

采用混酸对多壁碳纳米管进行表面处理,通过共混法制备出酸化多壁碳纳米管/水性聚氨酯(WPU)复合材料。通过FT-IR,拉曼光谱,SEM表征了多壁碳纳米管酸化前后的结构,通过TGA、拉力测试以及SEM研究了复合材料的热性能、力学性能和微观结构。结果显示,多壁碳纳米管通过混酸处理后表面羧基化,管壁卷曲程度降低。与纯WPU相比,当添加量为1.5%时,复合材料的断裂伸长率增加29%,当添加量在2%时,复合材料的拉伸强度增加169%,酸化碳纳米管在聚氨酯(PU)基体中均匀分散。酸化碳纳米管的添加显著提高了复合材料的热稳定性和导电性。     

Spectroscopic study of double-walled carbon nanotube functionalization for preparation of carbon nanotube / epoxy composites

A spectroscopic study of the amino functionalization of double-walled carbon nanotubes (DWCNT) is performed. Original experimental investigations by near edge X-ray absorption fine structure spectroscopy at the C and O K-edges allow one to follow the efficiency of the chemistry during the different steps of covalent functionalization. Combined with Raman spectroscopy, the characterization gives direct evidence of the grafting of amino-terminated molecules on the structural defects of the DWCNT external wall, whereas the internal wall does not undergo any change. Structural and mechanical investigations of the amino functionalized DWCNT/epoxy composites show coupling between epoxy molecules and the DWCNTs. Functionalization improves the interface between amino-functionalized DWCNT and the epoxy molecules. Electrical transport measurements indicate a percolating network formed only by the inner metallic tubes of the DWCNTs. The activation energy of the barrier between connected metallic tubes is determined to be around 20 meV.     

Thionine-interlinked multi-walled carbon nanotube/gold nanoparticle composites

Multi-walled carbon nanotube (MWCNT)/thionine/gold nanoparticle composites were prepared by binding gold nanoparticles to the surfaces of thionine-coated carbon nanotubes. TEM images show gold nanoparticles distributed uniformly on nanotube walls and ends. UV-Vis, Raman, FT-IR, and zeta potential measurements were used to examine the properties of the resulting products. The composites demonstrate significant electrocatalytic activity for oxygen reduction. Although only gold nanoparticles were investigated here, the method could be easily extended to attach other metallic nanoparticles to the sidewalls of carbon nanotubes.     

Preparation and properties of multi-walled carbon nanotube/carbon/polystyrene composites

Multi-walled carbon nanotube (MWCNT)/C/polystyrene (PS) composite materials were prepared by in situ polymerization of monomer in preformed MWCNT/C foams. MWCNT/C foams were preformed using polyurethane foam as template. The preformed MWCNT/C foams had a more continuous conductive structure than the carbon nanotube networks formed by free assembly in composites. The structure of the MWCNT/C foam network was characterized with scanning electron microscopy. The MWCNT/C/PS composites have an electric conductivity higher than 0.01 S/cm for a filler loading of 1 wt.%. Enhancement of thermal conductivity and mechanical properties by the preformed MWCNT/C foam were also observed.     

Improved thermal conductivity of epoxy composites using a hybrid multi-walled carbon nanotube/micro-SiC filler

By adding 6 wt% multi-walled carbon nanotubes (MWCNTs) or 71.7 wt% micro-SiC to an epoxy resin the thermal conductivities of the composites reached maxima that were respectively 2.9 and 20.7 times that of the epoxy alone. To further improve the thermal conductivity a method that partially replaces microfiller with nanofiller was used, and a thermal conductivity, 24.3 times that of the epoxy, was obtained with 5 wt% MWCNTs + 55 wt% micro-SiC.     

液体橡胶／环氧树脂复合材料的制备与性能研究

用端异氰酸酯基聚丁二烯液体橡胶与环氧树脂制得端异氰酸酯基聚丁二烯液体橡胶与环氧树脂反应物（ETPB）。在ETPB中加入纳米Al2O3,并选择适宜的固化剂固化,制得ETPB／Al2O3复合材料。测试了ETPB和ETPB／Al2O3复合材料于石英砂-水介质中的冲蚀磨损性能,并用扫描电子显微镜（SEM）对材料磨损表面进行了观察。结果表明,ETPB和ETPB／Al2O3复合材料在不同线速度下,随着线速度的增加冲蚀磨损率也随着增加。     

Synthesis,morphology and physical properties of multi-walled carbon nanotube/biphenyl liquid crystalline epoxy composites

We have developed multi-walled carbon nanotube/liquid crystalline epoxy composites and studied the effects of incorporation carbon nanotubes (CNTs) on the morphology, thermal and mechanical properties of the composites. The CNTs are functionalized by liquid crystalline (LC) 4,4′-bis(2,3-epoxypropoxy) biphenyl (BP) epoxy resin for the ease of dispersion and the formation of long range ordered structure. The epoxy functionalized CNT (ef-CNT) were dispersed in the LC BP epoxy resin that can be thermal cured with an equivalent of 4,4′-diamino-diphenylsulfone to form composite. The curing process was monitored by polarized optical microscopy. The results indicate the LC resin was aligned along the CNTs to form fiber with dendritic structure initially then further on to obtain micro-sized spherical crystalline along with fibrous crystalline. With homogeneous dispersion and strong interaction between nanotubes and matrix, the composite containing 2.00 wt.% ef-CNT exhibits excellent thermal and mechanical properties. When the amount of ef-CNT exceeds 2.00 wt.%, vitrification stage of curing is fast reached, which lowers the degree of conversion. As compared with the neat resin, the composite containing 2.00 wt.% ef-CNT increases the glass transition temperature by 70.0 °C, the decomposition temperature by 13.8 °C, the storage modulus by 40.9%, and the microhardness by 63.3%.     

Preparation and characterization of polyaniline/multi-walled carbon nanotube composites

This study describes the synthesis of doped polyaniline in its emeraldine salt form (PANI-ES) with carboxylic groups containing multi-walled carbon nanotubes (c-MWNTs) via in situ polymerization. Both Raman and FTIR spectra indicate that carboxylic acid groups formed at both ends and on the sidewalls of the MWNTs. Based on the π-π* electron interaction between aniline monomers and MWNT and hydrogen bonding interaction between the amino groups of aniline monomers and the carboxylic acid group of c-MWNT, aniline molecules were adsorbed and polymerized on the surface of MWNTs. Structural analysis using FESEM and HRTEM showed that PANI-ES/c-MWNT composites are core (c-MWNT)-shell (doped-PANI-ES) tubular structures with diameters of several tens to hundreds of nanometers, depending on the PANI content. The conductivities of these PANI-ES/c-MWNT composites are 50-70% higher than those of PANI without MWNT.     

Non-destructive functionalization of multi-walled carbon nanotubes with naphthalene-containing polymer for high performance Nylon66/multi-walled carbon nanotube composites

A new compatibilizer, poly(vinyl benzyloxy methyl naphthalene)-g-poly(t-butyl methacrylate-co-methacrylic acid), was synthesized for Nylon 66 (N66)/multi-walled carbon nanotube (MWCNT) composites. It has been shown that the naphthalene unit in the main chain of the compatibilizer interacts with MWCNTs by π–π interaction and that the carboxylic acid unit in the graft chain of the compatibilizer interacts with the amide group of N66. The use of the compatibilizer produces well-dispersed MWCNTs in N66 matrix, which results in improved mechanical and electrical properties of the composites, while the simple mixture of N66/MWNCTs without the compatibilizer exhibits poor mechanical and electrical properties due to severe aggregation of MWCNTs. It is also found that the compatibilizer with a small amount of carboxylic acids is more effective for improving the mechanical and electrical properties of N66/MWCNT composites.     

炭黑/环氧树脂复合材料阻温特性研究

分别以低结构炭黑(F101)和高结构导电炭黑(XE2)作为导电填料,不同牌号(E-54,E-51和E-44)的环氧树脂(EP)作为基体树脂,采用超声分散溶液混合法制备了炭黑/环氧树脂(CB/EP)复合材料.研究了CB结构、CB含量和EP基体等对复合材料正温度因数(PTC)效应的影响.结果表明:F101/EP复合材料具有...