Wangxi ZHANG
,
Jie LIU
,
Jieying LIANG
,
null
,
null
,
null
材料科学技术（英）
Structural changes in carbon fibers at each stage of, especially, preoxidation process are well known to play a great role in achieving the ultimate product quality. Differential scanning calorimetry (DSC), scanning electron microscope (SEM), density method and optical microscope were used to characterize the preoxidation extent. A conventional approach, e:g., density aim, to evaluate the extent of preoxidation is not very exact. A DSC curve of a PAN precursor only can provide general information, major in the temperature regime of preoxidation reaction. However, the evaluation of a preoxidation extent, especially from conventional preoxidation temperature with a great span regime of 200~400℃, is put forward in this paper, in which the evolution of core/shell morphological structure is a kind of straightforward evidence.
关键词:
Preoxidation
,
null
,
null
邢伟
,
阎子峰
新型炭材料
doi:10.3969/j.issn.1007-8827.2002.03.006
以石油焦为原料,KOH为活化剂合成了高比表面积超级活性炭.采用扫描电镜(SEM)和氮气低温静态吸附技术对超级活性炭样品的结构和性质进行了表征.同时,通过反应快速终止技术和原位TG-DTA实验侧重考察了石油焦预氧化对超级活性炭孔结构和表面性质的影响.实验表明:石油焦预氧化能够显著改变活化反应的进程和抑制高温恒温段中大孔的形成.红外测试亦显示石油焦预氧化能够促进活化过程中稠环芳香结构的解体和活性炭表面含氧物种的生成.
关键词:
石油焦
,
活性炭
,
预氧化
