Abstract
In-situ FTIR spectroscopic measurements were used to examine the thermal imidization behaviors of 6FDA-ODA PAA films in the presence of a strong tertiary amine base, such as piperazine, N,N’-dimethyl piperazine, piperidine, and 2,6-dimethyl piperidine. Large spectral changes in the FTIR spectra of 6FDA-ODA PAA films in the presence of curing accelerators were observed in the range of 110∼190 ℃, and strong tertiary amine bases used in this study accelerate the imidization reaction. Less sterically hindered piperidine with a strong base strength led to a relatively slow imidization reaction compared to piperazine, N,N’-dimethyl piperazine, and 2,6’-dimethyl piperidine. N,N’-dimethyl piperazine and 2,6-dimethyl piperidine are effective curing accelerators similar to piperazine.
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