Editing Polyimide (section)

===Analysis===
The imidization reaction can be followed via [[Infrared spectroscopy|IR spectroscopy]]. The IR spectrum is characterized during the reaction by the disappearance of absorption bands of the poly(amic acid) at 3400 to 2700&nbsp;cm<sup>−1</sup> (OH stretch), ~1720 and 1660 (amide C=O) and ~1535&nbsp;cm<sup>−1</sup> (C-N stretch). At the same time, the appearance of the characteristic imide bands can be observed, at ~1780 (C=O asymm), ~1720 (C=O symm), ~1360 (C-N stretch) and ~1160 and 745&nbsp;cm<sup>−1</sup> (imide ring deformation).<ref>K. Faghihi, J. Appl. Polym. Sci., 2006, 102, 5062–5071. Y. Kung and S. Hsiao, J. Mater. Chem., 2011, 1746–1754. L. Burakowski, M. Leali and M. Angelo, Mater. Res., 2010, 13, 245–252.</ref>⁠　Detailed analyses of polyimide<ref>{{Cite journal |last1=Kato |first1=Tomofumi |last2=Yamada |first2=Yasuhiro |last3=Nishikawa |first3=Yasushi |last4=Ishikawa |first4=Hiroki |last5=Sato |first5=Satoshi |date=2021-06-30 |title=Carbonization mechanisms of polyimide: Methodology to analyze carbon materials with nitrogen, oxygen, pentagons, and heptagons |url=https://www.sciencedirect.com/science/article/pii/S0008622321002839 |journal=Carbon |language=en |volume=178 |pages=58–80 |doi=10.1016/j.carbon.2021.02.090 |s2cid=233539984 |issn=0008-6223|url-access=subscription }}</ref> and carbonized polyimide<ref>{{Cite journal |last1=Kato |first1=Tomofumi |last2=Yamada |first2=Yasuhiro |last3=Nishikawa |first3=Yasushi |last4=Ishikawa |first4=Hiroki |last5=Sato |first5=Satoshi |date=2021-06-30 |title=Carbonization mechanisms of polyimide: Methodology to analyze carbon materials with nitrogen, oxygen, pentagons, and heptagons |url=https://www.sciencedirect.com/science/article/pii/S0008622321002839 |journal=Carbon |language=en |volume=178 |pages=58–80 |doi=10.1016/j.carbon.2021.02.090 |s2cid=233539984 |issn=0008-6223|url-access=subscription }}</ref> and graphitized polyimide<ref>{{Cite journal |last1=Kato |first1=Tomofumi |last2=Yamada |first2=Yasuhiro |last3=Nishikawa |first3=Yasushi |last4=Otomo |first4=Toshiya |last5=Sato |first5=Hayato |last6=Sato |first6=Satoshi |date=2021-10-01 |title=Origins of peaks of graphitic and pyrrolic nitrogen in N1s X-ray photoelectron spectra of carbon materials: quaternary nitrogen, tertiary amine, or secondary amine? |journal=Journal of Materials Science |language=en |volume=56 |issue=28 |pages=15798–15811 |doi=10.1007/s10853-021-06283-5 |bibcode=2021JMatS..5615798K |s2cid=235793266 |issn=1573-4803|doi-access=free }}</ref> have been reported.