Pyromellitic dianhydride → Acetic Anhydride

Participants

Reaction Steps

Polymer was made at room temperature by adding 3,4′-ODA, PPD, BPDA, and PMDA with stirring in DMAc in quantities to make polymers with compositions between 5 and 14 mole % BPDA and between 5 and 21 mole % PPD. The remaining monomers were PMDA as the dianhydride and 3,4′-ODA as the diamine. The polymers were each cast on a substrate and converted in a bath of 50 volume % acetic anhydride and 50 volume % beta-picoline, at room temperature, to form a gel film. The gel film was restrained and heated in an oven to dry and cure at 300° C. for 60 minutes, and then heated in 400° C. oven for 5 minutes. The properties were as follows:

Provenance & Evidence