Process optimization of a thermoplastic polyimidesulphone

Siloxane Modification of Bismaleimide Resins

“…12 Monitoring of the thermal deshydratation of the polyamic acid into the corresponding polyimide can be achieved using various analytical methods. 13 In Resins based on this general concept have been first studied and developed by RhonePoulenc, the French firm, 14 with its KERIMID (impregnation resins) and KINEL (moulding powders). According to this principle, the prepolymer resin is obtained by a MICHAEL addition, in bulk, of an aromatic diamine onto a bismaleimide, forming thus a maleimide terminated prepolymer, which easily polymerizes and crosslinks by heating ( Figure 2) into a material having the following main features: -good retention of thermomechanical properties even after long ageing at 250°C (as shown by the Tables I and II) * Fire resistance:…”