Aromatic Polymer Adhesives Polyaromatics

The most important resins available for use as adhesives in high-temperature structural applications are polybenzimidazoles (PBls) and polyimides (Pis), both of which are described later (see Sections 8.34 and 8.36). These resins are supplied as prepolymers containing open heterocyclic rings, which are soluble and fusible. At elevated temperatures, the prepolymers undergo condensation reactions that lead to ring closure and formation of insoluble and infusible 

Glass transition temperature of aromatic adhesives can be tailored by blending them with 

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