酚醛树脂/镀银碳纤维导热复合材料的制备与性能

Preparation and Properties of Phenolic Resin/Silver Nanoparticles Plating Carbon Fiber Thermal Conductive Composites

采用化学镀的方法在碳纤维(CF)上镀一层银膜,然后采用搅拌混合的方法制备了酚醛树脂/镀银碳纤维(Ag-CF)导热复合材料,通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、X射线能量色散光谱仪(EDS)等方法对其结构和性能进行表征。结果表明,大量的银粒子均匀分布在CF表面;酚醛树脂/Ag—CF导热复合材料的导热系数、冲击强度和拉伸强度随着Ag-CF含量的增加而逐渐增加;Ag-CF的含量为7.0%时,酚醛树脂/Ag-CF导热复合材料的综合性能最优,此时其导热系数为1.25 W/(m·K),冲击强度和弯曲强度分别为66.7 kJ/m^2和139.2 MPa;残炭率为30%时,添加量为7.0%的复合材料对应温度为500℃,高于纯酚醛树脂的450℃。

Silver plated carbon fiber （Ag-CF） was prepared by chemical plating and mixed with phenolic resin forming thermal conductive composites by the stirring and mixing method. The morphologies and properties of the composites were studied by scanning electron microscope （SEM）, energy dispersive spectrometer （EDS） and X-ray diffraction （XRD）. It was found that a large number of Ag nanoparticles covered the surface of carbon fiber. Thermal conductivity and mechanical properties of phenolic resin/Ag-CF composites increased with increasing Ag-CF content. When the content of the Ag-CF was 7.0 wt%, the thermal conductivity, impact strength, and flexural strength were 1.25 W/（m ·℃）, 66.7 kJ/m2, and 139.2 MPa, respectively. The temperature for 30% residual ratio was 500℃, which contrast to 450℃ for neat phenolic resin.