Synthesize and characterization of novel polyimide from 4,4 -(1,4-Phenylenediisopropylidene) bisaniline and aromatic tetracarboxylic dianhydride

Polyimides, as a class of polymers, are well known for their good mechanical properties and stability under thermal stresses upwards of 500ºC [1]. Well-made polymer films ofthis type are also flexible, allowing for their use in a variety of parts of the spacecraft and extra-vehicular equipment likespacesuits [2]. In general, polymers containing aromatic (benzene-containing) backbones are stronger on the macroscopic level but relatively hydrogen deficient, whilealiphatic polymers (like polypropylene and polyethylene) have higher hydrogen contents, but are relatively weak and degradeeasily [3]. The present article deals with the synthesis of novel heatresistant aromatic polyimide by the polymerization of 4,4 -(1,4-Phenylenediisopropylidene) bisaniline with aromatictetracarboxylic dianhydride through a conventional two-step method. The characteristics of polyimides such as thermalbehavior are also discussed.