Cardo polyheteroarylenes. Synthesis, properties, and characteristic features

In situ synthesis of copolymers based on polyvinylpyrrolidone and condensation polymers and their use as optical fiber coatings

“…PI based on 4,4 -(hexafluoroisopropylidene)diphthalic anhydride (1.00 mol), 9,9-bis(4 -aminophenyl)fluorene (0.75 mol) and 4,4 -(hexafluoroisopropylidene)dianiline (0.25 mol) was synthesized by one-step polycyclization in m-cresol medium [21]. The reaction proceeds at 180 • C for 5 h under Ar.…”

Synthesis and Properties of Novel Polyimides Bearing Sulfonated Benzimidazole Pendant Groups

“…The growth of the polymer chain (polyamic acid formation) and imidation take place almost simultaneously, which permits the attainment of fully imidized polyimides in a onepot process. [20,21] All of the current polynaphthalimides were prepared by this method, with m-cresol as the solvent, heating initially at 80 8C and then at about 180 8C to assure a complete imidation. The desired proportion of sulfonic groups in the copolyimides could be conveniently controlled by adjusting the ratio of sulfonated to non-sulfonated diamines.…”

Ionic Liquids as Novel Reaction Media for the Synthesis of Condensation Polymers

“…It is well known that DA NTCA exhibits low reactivity and does not form high-molecular-weight polyimides by common two-and one-step procedures in organic solvents (N,N-dimethylformamide (DMFA), N,N-dimethylacetamide (DMAA), N-methylpyrrolidone (NMP), nitrobenzene, m-cresol) in the absence of any catalyst even at temperatures as high as 200 8C (Table 1, entries 14, 16). [9] Thus, the reaction of such monomers is commonly carried out at 180-220 8C and in the presence of carboxylic acid as a catalyst (Table 1, entries 15, 17). The unique feature of our approach is the synthesis of polyimides in ILs as reaction media.…”