Polyimidazopyrrolones and related polymers. I. Dianhydrides and o‐acetamidodiamines

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Abstract
Solutions of polyimidazopyrrolone precursors prepared by reaction of tetraamines and dianhydrides in polar solvents tend to crosslink and gel very easily. Substitution of o‐acetamidodiamines for the tetraamines gives stable solutions. A study of cure mechanisms by TGA, infrared, and pyrolysis experiments with polymers and model compounds indicates that the acetylated materials are converted cleanly to imides at 150°C. At temperatures above 350°C, structural changes and further polymerization occur, with little imidazopyrrolone formation. Polymers derived from tetraamines cure by multiple mechanisms but finally yield the imidazopyrrolone structure. The acetylated polymers and copolymers give acceptable laminates but poor films.

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