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.

中文翻译：

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含 6FDA-ODA 聚酰胺酸固化促进剂的热酰亚胺化行为通过原位 FTIR 光谱

摘要 使用原位 FTIR 光谱测量研究了 6FDA-ODA PAA 薄膜在强叔胺碱（如哌嗪、N,N'-二甲基哌嗪、哌啶和 2,6-二甲基哌啶。在固化促进剂存在下，6FDA-ODA PAA 薄膜的 FTIR 光谱在 110~190 ℃范围内发生较大的光谱变化，本研究中使用的强叔胺碱加速了酰亚胺化反应。与哌嗪、N,N'-二甲基哌嗪和2,6'-二甲基哌啶相比，具有强碱强度的空间位阻较小的哌啶导致相对缓慢的酰亚胺化反应。N,N'-二甲基哌嗪和2,6-二甲基哌啶是类似于哌嗪的有效固化促进剂。