Norbomene-terminated imides

Norbomene-terminated imide NR-150B type polyimide Acetylene-terminated phenylquinoxaline Polyphenylquinoxalines with pendent phenylethynyl groups Semi-interpenetrating polyimide networks... 

The concept of norbomene-terminated oligo-imides was further studied at the NASA Lewis Research Center by researchers who developed the polymerization of monomeric reactants (PMR) approach. The method, represented in Fig. 9.18, involves a blend of both the dimethyl ester of 3,3 -benzophenonetetracarboxylic acid 42 and the mono-methylester of 5-norbomene-2,3-dicarboxylic acid 41 with 4,4 -methylenebisbenzeneamine 34 in solution in methanol. 

A wide range of imide prepolymers have been developed on the basis of this approach. The various forms differ primarily in the type of terminal reactive group employed so as to convert the prepolymer to a cross-hnked product Three main types have achieved prominence and shown potential as High-temperature adhesives, these being prepolymers based upon norbomene, acetylene and maleimide (bismaleimide) functionality. 

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