氟化中间相沥青改性碳纸的研究

Study on Carbon Paper Modifying with Fluorinated Mesophase Pitch

关键词:  碳纸  疏水改性  氟化沥青

Key Words:carbon paper  hydrophobic modification  fluorinated pitch

摘要:以氟化中间相沥青为疏水试剂，分别采取浸渍法和气相沉积法对碳纸进行疏水改性，考察了氟化中间相沥青负载工艺及负载量对碳纸微观形貌、厚度、表观密度、导电性和疏水性能的影响。结果表明，采取浸渍法改性比气相沉积法改性获得的碳纸疏水性能更优，相应的性质参数也有所变化。随着氟化中间相沥青负载量的增加，碳纸的厚度增加，表观密度减小，电阻率增加，接触角增加。当氟化中间相沥青负载量为10 wt%时，浸渍法改性获得的碳纸电阻率为5.6 mΩ·cm，接触角为139°，满足燃料电池中气体扩散层的使用要求。

Abstract:Using fluorinated mesophase pitch as additive， the carbon paper was hydrophobically modified by impregnation on vapor deposition process. The effects of two fluorinated mesophase pitch loading processes and loading amount on the microscopic morphology， thickness， apparent density， electrical conductivity and hydrophobic properties of carbon paper were investigated. The results showed that the modified carbon paper by impregnation had better hydrophobic properties than that by vapor deposition， and the corresponding property parameters were also changed. As the loading of fluorinated mesophase pitch increased， the thickness of the carbon paper increased， the apparent density decreased， the resistivity increased， and the contact angle increased. When the loading of fluorinated mesophase pitch was 10 wt%， the resistivity of the carbon paper obtained by impregnation was 5.6 mΩ·cm， with contact angle of 139°， which met the requirements of the gas diffusion layer in fuel cells.