添加炭黑和碳纳米管对酚醛树脂热解炭的结构及抗氧化性的影响(英文)

Effect of the addition of carbon black and carbon nanotubes on the structure and oxidation resistance of pyrolysed phenolic carbons

采用酚醛树脂为原料,分别以炭黑和碳纳米管作为改性添加剂制备酚醛树脂热解炭。利用差热分析(DSC)、X射线衍射分析(XRD)和压汞法孔径分析对酚醛树脂热解炭进行表征,探讨添加剂和热处理温度对树脂热解炭的结构和抗氧化性的影响。结果表明,碳纳米管和炭黑均可提高热解炭的石墨化度和抗氧化性;碳纳米管改性树脂热解炭的石墨化度高于炭黑改性树脂热解炭,但由于前者热解炭的显微结构中较高的气孔率,所以使其抗氧化性劣于后者。升高热处理温度同样可改善热解炭的抗氧化性和提高石墨化度。

Carbon black （ CB ） and carbon nanotubes （CNTs） were used as additives in phenolic resin. The effects of the additives and heat treatment temperature on the oxidation resistance and structure of carbon from the pyrolysed phe- nolic resin were investigated by differential scanning calorimetric analysis, X-ray diffraction, scanning electron microsco- py, and mercury intrusion porosimetry. It was observed that both CNTs and CB improved the graphitization degree and oxidation resistance of the pyrolytic carbons. The graphitization degree of carbons containing CNTs was higher than that of those with CB, but the oxidation resistance of the former was lower due to the higher porosity in the microstructure. An increase in the heat treatment temperature also resulted in an improvement in the graphitization degree and oxidation resistance of the carbons.