%0 Journal Article
%T New Evaluation on the Preoxidation Extent of Different PAN Precursors
%A Wangxi ZHANG
%A Jie LIU
%A Jieying LIANG
%A <br>Wangxi ZHANG
%A Jie LIU and Jieying LIANG
%J 材料科学技术学报
%D 2004
%I 
%X 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 pproach, 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 egime of 200～400℃, is put forward in this paper, in which the evolution of core/shell morphological structure is a kind of straightforward evidence.
%K Preoxidation
%K Polyacrylonitrile precursors and carbon fibers
%K Core/shell morphology<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=A8428B20049EB109&yid=D0E58B75BFD8E51C&vid=A04140E723CB732E&iid=E158A972A605785F&sid=F7BB24011DC0D223&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=3&reference_num=18