Thermostable Polymers from Dianhydrides of Aromatic Tetracarboxylic Acids and Tetra-amines

Polypyrrolones for membrane gas separations. I. Structural comparison of gas transport and sorption properties

“…28 Nevertheless, this study enables a few structural observations to be made about the 6FDA/PMDA-TAB polypyrrolones. Below 575°C, the thermal stability generally decreases with increased PMDA fractions in the polymer backbone.…”

11H-isoindolo[2,1-a]benzimidazoles (Review)

“…Pyrrones were first synthesized in 1965-1966 [31,32,58]. At the present time several reviews have been devoted to them [29,31,59], and we will not therefore discuss them in detail. The dianhydrides of various 1,2,4,5-tetracarboxylic acids and tetraamines have been used for the production of pyrrones.…”

“…The dianhydrides of various 1,2,4,5-tetracarboxylic acids and tetraamines have been used for the production of pyrrones. The polyaminoamido acid 49, polyaminoimide 50, and finally the pyrrone 51 are formed successively during the reaction [59,60]. (We will illustrate this for the case of the condensation of 1,2,4,5-tetraaminobenzene with pyromellitic anhydride.)…”

Perinone—New Life of an Old Molecule

“…Research into model compound reactions showed, that condensation between aromatic dianhydrides 8 and tetra-amines 53 proceeds in three successive stages: formation of an amide-amino-acid, cyclisation of the latter to an aminoimide, and finally conversion of this product into an aroylenebenzimidazole polymer BBB [78][79][80]. The proposed mechanism of polycondensation is shown in Figure 22.…”