| Abstract: | The thermal emission characteristics of polypyromellitimides have been examined as a function of temperature by measurement of the power required to maintain steady-state temperatures in an evacuated system. The emissivity was derived and found to increase with increasing temperature up to a saturation limit of above 0.9 at temperatures above 475°K. The effect is explained as a thermal population of excited infrared transitions. Power emitted is dominated by the most intense bands which are common to absorption and emission spectra. |
