| 초록 |
A water-soluble polyimide precursor was synthesized and characterized. It has been found that this poly(amic acid) salt polymer is highly soluble in water-based solvents, a feature that is useful for polyimide film preparation, especially when environmental protection is heavily weighed. And in this study, the solubility of this poly(amic acid) salt in water-based solvent with different DMEA% was studied. Finally, this poly(amic acid) salt polymer was dissolved in water to make homogenous solution. The aqueous solution shows higher stability to hydrolytic degradation than free poly(amic acid) dissolved in highly polar organic solvents. It was also found through FT-IR that this poly(amic acid) salt in aqueous solution begins to be imidized at 80ºC with 50% imidization conversion degree and 97% of imidization conersion degree can be achieved at 160ºC, both under vacuum condition. The temperatures are much lower than the corresponding imidization temperatures for conventional poly(amic acid) polymer. These features make the synthesized poly(amic acid) salt polymer a preferred precursor for preparation of polyimide film. |
