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2,2-Bis[4-(4-aminophenoxy)phenyl]propane (BAPP), also known as 4,4'-(4,4'-Isopropylidenediphenyl-1,1'-diyldioxy)dianiline, is a diamino monomer with a diphenoxy-phenyl core. Since the molecule has two amine groups at both ends, it can be cross-linked with carboxylic acids or carboxylic dianhydrides to synthesize polyimides. It is commonly as a monomer for the preparation of polyimides in application of batteries, fuel cells, low dielectric materials and OLEDs.

4,4'-(4,4'-Isopropylidenediphenyl-1,1'-diyldioxy)dianiline is white solid

4,4'-(4,4'-Isopropylidenediphenyl-1,1'-diyldioxy)dianiline is used for preparation polyimide and epoxy resin material.