Citation: Wen-ke Yang, Fang-fang Liu, Guo-min Li, En-song Zhang, Yan-hu Xue, Zhi-xin Dong, Xue-peng Qiu, Xiang-ling Ji. Comparison of Different Methods for Determining the Imidization Degree of Polyimide Fibers[J]. Chinese Journal of Polymer Science, ;2016, 34(2): 209-220. doi: 10.1007/s10118-016-1749-9 shu

Comparison of Different Methods for Determining the Imidization Degree of Polyimide Fibers

Wen-ke Yang ^1,2,3 ,
Fang-fang Liu ^4,2,3 ,
Guo-min Li ⁵ ,
En-song Zhang ^1,2,3 ,
Yan-hu Xue ⁶ ,
Zhi-xin Dong ⁵ ,
Xue-peng Qiu ⁵ ,
Xiang-ling Ji ⁶

1.
1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
2.
2. University of Chinese Academy of Sciences, Beijing 100049, China
3.
4.
1. Laboratory of Polymer Composites and Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
5.
Laboratory of Polymer Composites and Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
6.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Received Date: 10 August 2015
Revised Date: 9 October 2015

Fund Project: This work was financially supported by the National Basic Research Program of China (No. 2014CB643603) and the National Natural Science Foundation of China (No. 51173178).

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-1 band. Based on the 1350 cm-1 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.
- Imidization degree,
- Polyimide fibers,
- Polyamic acid,
- Polyimide,
- Characterization
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