AbstractThe aging behavior of two experimental polyarylsulfone films is discussed. The mechanical and electrical properties of the films were measured as a function of time at temperatures of 300°, 275°, and 250°C. The effect of “reprocessing” the material is also reported. DTA and TGA analysis, coupled with other aging test results, point out the excellent thermal stability of the polyarylsulfones. However, some peculiar behavior is exhibited by the unrefined polymer. Free film aging of this material showed no signs of discoloration or deterioration in properties after 1000 hr at 300°C. Film aged wrapped on metal and glass rods discolors badly, is subject to stress cracking, and embrittles. The reprocessed'' film is superior to its predecessor and exhibits none of the disadvantages that characterize the unrefined polymer. Solubility studies, coupled with the other aging tests, provided some insight into the degradation phenomenon of this polymer. Resistance to ultraviolet light is extremely poor. Reprocessing of the material provided for a much superior film material with a higher level of mechanical, electrical, optical, and thermal pro
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