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Citation: JIN Ying, ZENG Guangfu, ZHU Danyang, HUANG Yan, SU Zhaohui. Analysis of Structure and Imidization of Poly (amic acid) Using FTIR Spectroscopy[J]. Chinese Journal of Applied Chemistry, ;2011, 28(3): 258-262. doi: 10.3724/SP.J.1095.2011.00332 shu

Analysis of Structure and Imidization of Poly (amic acid) Using FTIR Spectroscopy

1.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Corresponding author: SU Zhaohui,
Received Date: 9 June 2010
Available Online: 31 August 2010
Fund Project: 国家自然科学基金创新研究群体科学基金(50921062)资助项目 (50921062)

We monitored the imidization process of poly(amic acid) synthesized from pyromellitic dianhidride and 4, 4'-oxydianiline, and analyzed the IR bands of the poly(amic acid) and the polyimide after thermal imidization using variable temperature FTIR spectroscopy in transmission mode. We investigated peak assignments of the poly(amic acid) and the polyimide and found——COO^- and——NH₂⁺ in the system. The C=O symmetrical and asymmetrical stretching vibrations in——COO^- locate at 1607 and 1406 cm^-1 respectively, NH₂⁺ stretching vibration locate at 3200, 3133, 2938, 2880, 2820, 2610 cm-1. According to the identified IR absorption peaks of ——COO^- and ——NH₂⁺, we proposed the mechanism of the imidization process of poly(amic acid) that during the imidization H⁺ from COOH of the poly(amic acid) can move to NH of the poly(amic acid) and form ——COO^- and NH₂⁺, then the intermediate cyclodehydrates to polyimide at last.
- poly (amic acid),
- imidization,
- FTIR
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