氧化钴溶胶复合酚醛树脂的热解碳结构变化

摘要

Modified phenolic resins were obtained by doping with cobalt oxide sol using ethanol as medium, and then treated in coke bed after hardening under the condition of buried carbon. The structure of pyrolytic carbon was studied by means of scanning electron microscopy （SEM）, high-resolution transmission electron microscopy （HRTEM） and X-ray diffraction （XRD）. Results showed that cobalt oxide sol was dispersed homogeneously in phenolic resins, the transition metal was produced in situ and then acted as a catalyst in pyrolysis process of phenolic resins, converting amorphous carbon into graphite structure. The scanning electronic microscope and the transmission electron microscope images of pyrolytic carbon showed that there were massive carbon nano-tube structures formed in the pores of pyrolytic carbon. The content and appearance of the carbon nano-tubes varied with the content of cobalt oxide sol.%以乙醇为介质将制备的氧化钴溶胶与酚醛树脂进行复合,经固化后在埋炭条件下炭化处理,制备热解碳。借助场发射扫描电镜、高分辨率透射电镜、X射线衍射仪等手段对热解碳的晶体结构、显微结构进行了分析表征。结果表明：氧化钴溶胶粒子在酚醛树脂中以纳米尺寸均匀分散,复合树脂热解过程中氧化钴被还原为单质钴,从而对树脂热解过程起到了催化作用,使其由无定形玻璃态碳部分转变为石墨化碳。对热解碳的显微结构分析表明,热解碳中有大量的碳纳米管生成,其含量、形貌与氧化钴溶胶掺杂量有关。