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测量了不同氧化深度的三类碳纤维(丙烯腈长丝、丙烯腈碳毡和粘胶碳毡)的低温氮吸附等温线。Pickett修正三参数BET方程能很好地关联这些等温线,三类碳纤维具有不同的n值。应用V—n作图法获得了它们的主要孔结构参数,利用Mp—Wp和D-R—Wp的组合方法获得了它们的孔分布数据。结果指出,总表面积、总孔体积、微孔表面积和微孔体积的大小与碳化温度和碳化原料有关,并且随氧化深度而增加;但非微孔表面积基本保持恒定,约为4—12m~2/g。微孔分布的最可几孔半径随氧化深度增加而减小,各类样品的非微孔分布几乎落在同一条孔分布曲线上。
Three kinds of carbon fibers with different oxidation depths (acrylonitrile filaments, acrylonitrile carbon felt and viscose carbon felt) were measured at low temperature nitrogen adsorption isotherms. Pickett’s modified three-parameter BET equation correlates well with these isotherms, and the three types of carbon fibers have different n-values. Their main pore structure parameters were obtained by V-n mapping, and their pore distribution data were obtained by the combination of Mp-Wp and D-R-Wp. The results indicate that the total surface area, total pore volume, micropore surface area and micropore volume are related to the carbonization temperature and the carbonization feedstock and increase with the depth of oxidation; however, the non-micropore surface area remains essentially constant at about 4-12 m 2 / g. The most probable hole radius of the micropore distribution decreases with the increase of the oxidation depth. The non-micropore distribution of various samples falls almost on the same pore distribution curve.