| 초록 |
Polyimide is widely used in various fields due to its excellent mechanical performance and thermal stability. Unlike conventional synthetic approach, hydrothermal polymerization enables the synthesis of polyimide without using toxic solvents and catalysts. In this study, we report the synthesis of polyimide microparticles (PIMs) through hydrothermal polymerization with three isomers of phenylene diamine (PDA) and mellitic acid (MA). We found that the three structural isomers of PDA afforded the fine control over the morphology of PIMs with varying dimension. To explain the morphology difference with the type of PDA precursor, we analyzed chemical composition of PIMs, and the fraction of amide to imide bond varies in each PIMs and the population of the polar group is reduced during the condensation reaction, resulting in phase separation. Based on these results, we suggest the mechanism that explain morphology difference with bond rotation possibility during phase separation. |
