New high-temperature polyimides to push high-performance polymer boundaries

摘要

In this paper the authors review the main properties of polyimides and explain the influence of certain chemical structures on the obtained mechanical and thermal properties. Based on two examples new developments are presented, with which limitation of existing products have been overcome and the operating temperature could be expanded. A new type of polyimide molding powder shows extraordinarily high thermo-oxidative stability with constant strength over more than 1000 hours, when storing at 340°C in air. A new polyimide fiber with higher Tg demonstrates less shrinkage, enabling use in filtration processes with surge temperatures up to 280°C.