针对聚丙烯腈(PAN)预氧纤维径向结构的分布特点,利用PAN预氧化结构对可见光的吸收作用,以可见光在纤维横截面上的透过率(光密度)为衡量标准,建立一种可定量表征PAN预氧化纤维径向结构的方法,即光密度法.结果表明:当测试样品厚度为400nm、光强为800lx时,光密度法表征纤维预氧化结构的径向分布特征最为准确灵敏.与传统的皮芯结构表征方法相比,该方法不仅可表示不同预氧化条件下纤维在相同区域的预氧化程度,还可获得预氧化程度在径向的分布情况.将该方法应用于PAN纤维的预氧化工艺研究,结果显示此方法可精确表达出工艺与结构的相关性,表明光密度法作为一种PAN预氧化程度表征的新方法,可在PAN预氧化径向结构研究中发挥积极的作用.
According to the radial distribution characteristics of PAN pre-oxidized fiber ,the optical density method which can quantitatively characterize the radial structure of pre-oxidized PAN fiber is established ,taking advantage of the light-absorbing of PAN pre-oxidized structure .The results show that when the sample's width is 400 nm and the light intensity is 800 lx ,the optical density method characterize the radial distribution characteristics of PAN pre-oxidized fibers the most effectively and accurately .Compared with the traditional skin-core structure characterization method ,this method not only expresses the pre-oxidized degree in the same domain under different pre-oxidation processes , but also obtains the radial distribution of pre-oxidized degree .Applying this method to the process re-search of pre-oxidized PAN fiber ,the results show that this method can reveal a correlation between the process and structure ,indicating the optical density method as a new method for characterization of PAN pre-oxidized fiber can play an active role in the study of pre-oxidized PAN radial structure .
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