| 초록 |
With the development of advanced technology, it was intended to make high-strength heat-resistant polyimide for future military power. In this study, an effort was made to make polyimide that satisfies a 95% decomposition temperature of 400°C or higher and a tensile strength of 80 Mpa or higher. The structures of the resulting compounds and polyimides were analyzed by 1H-NMR (proton nuclear magnetic resonance spectroscopy), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and UTM. Amide-type AA1 and AA2 showed thermal stability of 410~421 °C under the influence of the cyclohexyl group contained in the monomer, and sufficiently achieved over 400 °C when the Td was 95%. Although the mechanical properties of the amide system showed some differences depending on the type of dianhydride used together with diamine, the tensile strength was 86~87Mpa, and the target 80Mpa or higher was easily achieved. All of the goals set were achieved. |
