Does DMA heating cause decomposition?
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As a solvent, DMA is processed using vacuum distillation; however, in the distillate obtained after processing, the levels of water and light components increase. Does DMA decompose at 180°C, resulting in the formation of water and light components?
DMA must have partially decomposed at 180°C. Generally, amides have poor thermal stability; for example, DMF begins to decompose to varying degrees when distilled near its boiling point of 153°C, and the decomposition products are complex, including water, methylamine, dimethylamine, CO, etc. According to the information I found, DMA’s boiling point is supposed to be between 163°C and 165°C, so 180°C is well above its normal boiling point, which means decomposition definitely occurs! However, there may be other factors in the situation you described, because through vacuum distillation, decomposition products such as water should be removed, so the remaining composition should not contain water! Further analysis is recommended!
I'm sorry! In the previous post, I mixed up the substances! Consider DMA as DMAc; therefore what was said is incorrect – it refers to the case of DMAc. Please forgive me. I have never used DMA, so I am not familiar with its properties, and they are not mentioned in the solvent manual either. Let’s learn about it together!