Comparison of different methods for determining the imidization degree of polyimide fibers

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• 作者：Wen-ke Yang ; Fang-fang Liu ; Guo-min Li ; En-song Zhang…
• 关键词：Imidization degree ; Polyimide fibers ; Polyamic acid ; Polyimide ; Characterization
• 刊名：Chinese Journal of Polymer Science
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：34
• 期：2
• 页码：209-220
• 全文大小：1,312 KB
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• 作者单位：Wen-ke Yang (1) (3)
  Fang-fang Liu (2) (3)
  Guo-min Li (2)
  En-song Zhang (1) (3)
  Yan-hu Xue (1)
  Zhi-xin Dong (2)
  Xue-peng Qiu 閭遍洩楣?/a> (2)
  Xiang-ling Ji 濮浉鐜?/a> (1)
  
  1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
  3. University of Chinese Academy of Sciences, Beijing, 100049, China
  2. Laboratory of Polymer Composites and Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Condensed Matter Physics
  Industrial Chemistry and Chemical Engineering
  Polymer Sciences
  Characterization and Evaluation of Materials
  
• 出版者：Chinese Chemical Society and Institute of Chemistry, CAS, co-published with Springer
• ISSN：1439-6203

文摘

In this study, polyimide fibers at different stages of imidization were characterized by TGA, DSC, and FTIR. The imidization degree (ID) calculated by TGA was based on the weight loss of each sample, which was caused by the imidization of residual amic acid groups. The results of TGA showed good regularity with the thermal treatment temperature of the PI fibers. For DSC, the ID was calculated based on the area of endothermal peak of each sample. Compared with TGA, DSC showed a relatively higher value because the endothermal peak was reduced by the exothermic re-formation of polyamic acid which may be partially degraded during thermal treatment. The IDs obtained by the FTIR spectra generally showed poorer regularities than those obtained by both TGA and DSC, especially for the results calculated using the 730 cm鈭? band. Based on the 1350 cm鈭? band, the obtained IDs showed better agreement with the TGA or DSC results. The results obtained by these three methods were compared and analyzed. The ID obtained by TGA showed much more reliability among these three methods. Keywords Imidization degree Polyimide fibers Polyamic acid Polyimide Characterization