PAN预氧纤维径向结构的光密度法研究

doi:10.11868/j.issn.1001-4381.2015.001275

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摘要

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。

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	钟珊
	徐帆
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	徐樑华

关键词 ： PAN纤维, 光密度法, 径向结构, 预氧化程度

Abstract：

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 research 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.

Key words： PAN fiber optical density method radial structure pre-oxidation

收稿日期: 2015-10-25 出版日期: 2017-02-23

中图分类号:

TQ342⁺.741

基金资助:国家973项目(2011CB605602)

通讯作者: 徐樑华 E-mail: xulh@mail.buct.edu.cn

作者简介: 徐樑华(1960-),男,研究员,博士生导师,主要从事高性能聚丙烯腈基碳纤维的研究,联系地址:北京市朝阳区北京化工大学碳纤维及功能高分子教育部重点实验室(100029),xulh@mail.buct.edu.cn

引用本文:

钟珊, 徐帆, 雷帅, 武帅, 徐樑华. PAN预氧纤维径向结构的光密度法研究[J]. 材料工程, 2017, 45(2): 65-71.
Shan ZHONG, Fan XU, Shuai LEI, Shuai WU, Liang-hua XU. Optical Density Method of Radial Structure of PAN-based Pre-oxidized Fibers. Journal of Materials Engineering, 2017, 45(2): 65-71.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.001275 或 http://jme.biam.ac.cn/CN/Y2017/V45/I2/65

Fig.1 不同热处理时间下的PAN纤维截面结构图 (a)30min;(b)40min;(c)50min;(d)60min;(e)70min

Fig.2 皮芯比与热处理时间之间的关系

Fig.3 环化结构相对含量变化趋势
(a)不同热处理时间下，预氧纤维的核磁谱图；(b)特征环化结构相对含量随热处理时间的变化趋势

Fig.4 被测区域在PAN纤维径向分布示意图

Table 1 径向分布数据点上对应D_m值

Fig.5 光强700lx且不同样品厚度下PAN预氧纤维截面结构图
(a)1000nm;(b)500nm;(c)300nm

Fig.6 光强700lx且不同样品厚度下PAN预氧纤维径向平均光密度分布
(a)1000nm;(b)500nm;(c)300nm

Fig.7 在样品厚度400nm且不同光强度下PAN预氧纤维径向平均光密度分布图
(a)300lx;(b)500lx;(c)800lx

Fig.8 PAN预氧纤维径向平均光密度随热处理时间的变化分布图

Fig.9 PAN预氧纤维平均光密度标准差变化趋势图

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