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Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (10): 2100.

• Articles • Previous Articles     Next Articles

PAN-based Preoxidative Fiber Cyclized Degree of Strict Quantitative Characterization

GAO Yu1, GAO Zhong-Min1,2*, LI Xiang-Shan3, GUO Jian-Qiang4, WEN Yue-Fang4, YANG Yong-Gang4   

  1. 1. College of Chemistry,
    2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,
    3. College of Materials Science and Engineering, Jilin University, Changchun 130012, China;
    4. Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
  • Received:2009-01-09 Online:2009-10-10 Published:2009-10-10
  • Contact: GAO Zhong-Min. E-mail: gaozm@jlu.edu.cn

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Abstract:

PAN-based preoxidative fiber was prepared under the conditions of constant temperature and fixed-length. Measurement of the preoxidative fiber needs the method of long-period multi-layer structure of small-angle X-ray scattering. Analysis of patterns show that long period L of the preoxidative fiber gotten by the different preoxidation time is average 11.7 nm; preoxidation time ranges from 20 min to 210 min, the volume fraction X0 /L of the cyclization phase volume fraction increases from 7.9% to 86.5%. However, AI values of cyclization index of the preoxidative fiber sample of the same batch, measured through the wide-angle X-ray scattering method, are much more smaller. It is more exact for using X0/L to characterize the degree of cyclization of pre-oxygen wire quantitatively.

Key words: PAN-based preoxidative fiber; Cyclization structure phase; Cyclization phase volume fraction; Long-period small-angle X-ray scattering

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