Polyimides: Chemistry, Processing, Properties

Advances in the Chemistry and Applications of Bismaleimides

“…those produced by (1) condensation cure and (2) addition cure. Figure 2.2 illustrates the typical chemistry involved in making condensation cured polyimides.…”

“…In most aerospace and other engineering applications, temperatures and pressures exceeding these values make it difficult to process composites. 1 The problem with epoxies is that their upper temperature range for structural performance is approximately 3S0°F (177°C). Up to 300°F (149°C) performance is possible for epoxies exposed to moist environments, which limits the applications where they can be used to those where relatively non-thermally critical structural parts are required.…”

Polymers with Heterocyclic Rings in the Chain

“…15 9- 161 The system, however, is not without its drawbacks. In particular, an imbalance of prepolymer melting and cure temperatures has excluded its application in important autoclave molding processes.…”