Successful synthesis of a 1 : 1 salt monomer derived from bis(4-aminophenyl) ether and pyromellitic acid for direct polycondensation to an aromatic polyimide

Preparation of Polyimide Powders via Hydrothermal Polymerization and Post-Heat Treatment for Application to Compression-Molding Materials

“…When the MS was thermally imidized at 360 °C for 1 h, the inherent viscosity of the obtained PMDA-ODA PI powder was about 1.0 dL/g (in concentrated sulfuric acid). 42 XRD Analysis and Degree of Crystallinity of T-PI Powders. XRD patterns for MS/PI, T-PI, and std-MS powders are shown in Figures S3 and S4.…”

“…Imai et al investigated the inherent viscosity of PMDA-ODA PI powders prepared via SSP of PMDA-ODA MS. When the MS was thermally imidized at 360 °C for 1 h, the inherent viscosity of the obtained PMDA-ODA PI powder was about 1.0 dL/g (in concentrated sulfuric acid) …”

Polyimide Thin Films Produced by Direct Solid-State Polymerization of an Amino Anhydride Monomer

“…Whereas a few examples of the formation of polyimide films using volatile solvents such as THF/methanol are known, one-step solution polymerization is usually done in boiling m -cresol and poly(amic acid) solutions, used in two-step polyimide formation, containing typically 80 wt % of an amide solvent such as 1-methyl-2-pyrrolidinone. Imai et al were able to produce both aromatic and aromatic/aliphatic polyimides by thermal treatment of nylon salt-type monomers in the solid state . Additionally, vapor deposition techniques at elevated temperatures have been used to form thin and ultrathin polyimide films .…”

Aromatic and Heterocyclic Polymers—What Future?

“…And the T g of ODA/PMA is 410 • C (170 • C above the polymerization temperature). The polymerization below T m or T g is explained by the good organization of the crystalline salt [30,31].…”

“…Aliphatic aromatic copolyimides would be interesting candidates and a different synthetic pathway could be used: for example the copolymerization of an aliphatic diaminetetracarboxylic salt with an aromatic diamine-tetracarboxylic salt [30,31].…”