Application of pyromellitic anhydride in one-step synthesis of imide-ester resins
A one-step synthesis of polyesterimide resins containing groupings of bisfN-carboxymethyllpyromellitimide, formed in situ from p yromellitic anhydride and glycine, was elaborated. The remaining substrates used in the synthesis of the resins were: dimethyl terephthalate, tris(2-hydroxyethyl) isocyanurate, glycerol, and ethylene glycol. Four types of resins differing in the content of imide rings were obtained. Their molecular weights, softening temperatures, hydroxyl numbers and acid numbers were determined. These resins were also evaluated as components of insulating varnishes and it was found that one of these resins gives coatings with good mechanical and thermal properties. The presented method of synthesis of polyesterimide resins eliminates from the process the hitherto commonly used carcinogenic aromatic diamines.
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