Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1069, Issue -, Pages 196-199Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2014.02.012
Keywords
6FDA-ODA poly(amic acid); Thermal imidization; In situ FTIR spectroscopy; 2D correlation spectroscopy; 2D gradient mapping method
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2010-0007760]
- National Research Foundation of Korea [2010-0007760] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Two-dimensional (20) gradient mapping method and 2D correlation analysis of in situ FTIR spectra were used to probe the thermal imidization-induced spectral changes in 6FDA-ODA poly(amic acid) (PAA) films prepared by a reaction of 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 4,4'-oxydianiline (ODA) in N,N'-dimethylacetamide. Large spectral changes in the in situ FTIR spectra of 6FDA-ODA PAA film were observed in the range, 130-230 degrees C. The thermal imidization of 6FDA-ODA PAA films strongly affects the spectral changes in amic acid groups in the PAA unit. The spectral change in the amic acid groups occurred before those of the imide ring. The cyclic anhydrides, isoimdes and intermolecular links are present together with the imide ring in the thermally-cured 6FDA-ODA PAA films. (C) 2014 Elsevier B.V. All rights reserved.
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