木纤维/碳纳米管复合无胶纤维板的制备及其性能

为降低室内电磁波污染现象,在人们广泛应用的纤维板上复合具有吸波性能的碳纳米管,通过胶磨和热压的方法制备木纤维/碳纳米管复合无胶纤维板。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)和傅里叶红外光谱仪(FT-IR)对复合材料的形貌结构进行表征。结果表明:木纤维经过胶磨分层,复合材料经过热压出现层状结构; 碳纳米管已成功附着于木纤维表面; 在26.6°出现碳纳米管(006)的特征峰; 木纤维和碳纳米管之间以酯键和氢键的方式进行连接。复合材料与无胶纤维板相比,静曲强度和弹性模量分别提高了约100%和20%。复合材料在厚度5 mm、频率9.8 GHz,到厚度3.5 mm、频率16.7 GHz范围内,反射损耗出现最低峰-7.3 dB。碳纳米管赋予了复合材料良好的导电性,其电导率为0.715 S/m。
Fiberboard is widely used in all aspects of interior decoration, and the research of binderless fiberboard is a hot-spot. With the rapid development of wireless communications indoors and outdoors, the electromagnetic interference(EMI)pollution has become much more serious. In order to reduce the electromagnetic interference pollution in the room, we integrated carbon nanotubes with microwave absorption properties on fiber boards. Thus, the wood fiber/carbon nanotube composite binderless fiberboard was fabricated successfully through grinding and hot-pressing methods. The morphology and structure of the composite were characterized by the scanning electron microscope(SEM), transmission electron microscope(TEM), X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FT-IR). The results of SEM images showed that the wood fiber was laminated by the grinding and the composite material appeared layered structure by hot-pressing. The results of TEM images illustrated that the carbon nanotubes were successfully attached on the lignocelluloses surface. The XRD patterns presented that the characteristic peak of carbon nanotubes(006)appeared at 26.6°. The FT-IR spectra displayed that the wood fiber and carbon nanotubes were connected by ester bonds and hydrogen bonds. The results of mechanical property tests showed that the modulus of rupture(MOR)and modulus of elasticity(MOE)of the composite material increased by about 100% and 20% comparing with the binderless fiberboard. The results of electromagnetic absorption property showed that the composite material had the lowest reflection loss peak at -7.3 dB in the range of 3.5-5.0 mm in thickness and 9.8-16.7 GHz in frequency. The results of the electrical conductivity test revealed that the carbon nanotubes imparted good conductivity to the composite material and the conductivity was 0.715 S/m. Therefore, the results of this study will provide a functional material with high strength, good conductive and electromagnetic shielding properties in the field of interior decoration