Polybismaleimides are a type of functional imide polymer. They are also known as high performance thermosetting addition-type polyimide polymers. They are obtained by the Michael reaction, i.e., addition of diamine to the unsaturated sites of bismaleimides. They possess high tensile strength and rigidity at elevated temperature. Polybismaleimides also have excellent chemical resistance including alcohols, hydrocarbons, and halogenated solvents. Additionally, they have outstanding dimensional stability, excellent electrical properties, long-term heat and oxidative stability, and relatively low propensity for moisture absorption. These reactive polybismaleimides polymers require high curing temperatures of more than 150°C and long curing times. Polybismaleimides are utilized as a component resin for filament winding, laminates, friction pads, and bearings. Polybismaleimides can replace metal and other materials in many structural applications due to their high strength and excellent long-term creep resistance.