碳纳米管/氮化碳纳米片导热聚合物的制备和性能

Preparation and Properties of Thermal Conductive Polymer of Carbon Nanotube/Carbon Nitride Nanosheet

以静电自组装的方式将改性的碳纳米管(CNTs)和石墨相氮化碳(g-C_(3)N_(4))制备成杂化填料CNT@CNNns,并填充到环氧树脂(EP)中以制备导热复合材料。采用X射线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)、Zeta电位仪、扫描电镜(SEM)、热重分析仪(TGA)和热导率仪(Hot Disk)等对样品进行了表征测试。结果表明,CNT吸附于CNNns表面形成“岛-桥”网络,在导热中发挥协同效应。当CNT@CNNns负载质量分数为27.8%时,CNT@CNNns/EP的热导率提升至0.9554 W·m^(-1)·K^(-1),高于简单共混制备的CNT-CNNns/EP(0.7487 W·m^(-1)·K^(-1))和EP(0.2034 W·m^(-1)·K^(-1));热稳定性显著提高,化合物减重50%的温度提升至520.352℃(纯EP仅392.313℃);复合材料保持了良好的绝缘性能。

A hybrid filler CNT@CNNns was prepared by electrostatic self-assembly of modified carbon nanotubes(CNTs)and graphite carbon nitride(g-C_(3)N_(4)).It was filled into epory resin(EP)to prepare thermal conductivity composites.The samples were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),Zeta potential test,scanning electron microscopy(SEM),thermogravimetric analysis(TGA),and thermal conductivity analyzer(Hot Disk).The results show that CNTs which was adsorbed on the surface of CNNns formed an“Island-Bridge”network,which plays a synergistic effect in heat conduction.When the loading is 27.8%,the thermal conductivity of CNT@CNNns/EP is increased to 0.9554 W·m^(-1)·K^(-1),which is higher than that of CNT-CNNns/EP prepared by simple blending(0.7487 W·m^(-1)·K^(-1))and EP(0.2034 W·m^(-1)·K^(-1)).The thermal stability is significantly improved,and the temperature of the compound weight loss by 50%increases to 520.352℃(EP is only 392.313℃).And the composite also maintains excellent insulation properties.