New approach to synthesis of aromatic N-phenyl-substituted polyamides

It is shown that polyimidates obtained by polycondensation of bisphenols with imidoyl chlorides may be transformed into N-phenylsubstituted aromatic polyamides. The rearrangement occurs as a result of heating at 260–340°C, and, in a diphenyl ether solution, at 240°C. The resulting polymers are soluble in organic solvents and demonstrate high thermooxidative stability.     

Synthesis of polyamidines based on aromatic bis(imidoyl) chlorides in solution

New amidine-containing polymers were prepared by the polycondensation of aromatic diamines with bis(imidoyl) chlorides in polar organic solvents in the presence of various catalysts (triethylamine, tributylamine, and pyridine N-oxide). Optimal synthesis conditions, namely, temperature, duration, concentration of monomers and catalyst, and the order of reagent loading, were established. The structure of polyamidines was studied by elemental analysis and IR and NMR spectroscopy. When the polymers were heated to 250°C in vacuum, their molecular masses increased.     

Thermodynamic characteristics of polyheteroarylene blends

The influence of the polybenzimidazole-to-polybismaleimide ratios and the chemical nature of sorbates on the thermodynamic characteristics of thermally structured blends of the polymers is studied. The optimum component ratio for the production of blends with good mechanical properties is found. The proton conductivity of the blends doped with phosphoric acid and acid zirconium phosphate is investigated.     

Heat Resistance of Polyamidobenzimidazoles

Thermal degradation of polymers based on polyamidobenzimidazoles was studied in relation to the monomeric units structure and mole fraction of the initial monomers.     

Rearrangement of polyarylene benzimidates into poly(N-arylenebenzamides)

The transformation of polyarylene benzimidates prepared by polycondensation of bisphenols with benzimidoyl chlorides in N-methyl-2-pyrrolidone into poly(N-arylenebenzamides) was studied.     

Polyamidobenzimidazoles as Polymeric Materials for Cold Climate

A frost-resistant polyamidobenzimidazole-based polymer composite is synthesized from 3,3',4,4'-tetraaminodiphenyl oxide, diphenyl adipate or diphenyl sebacate, and hexamethylenediamine or -caprolactam. As stabilizers for the polymers were used 4-phenyl-2,2,5,5-tetramethyl-3-imidazoline-3-oxide-1-oxyl and carbon black.     

Manifestations of crystallinity in polyamidobenzimidazoles

Polyamidobenzimidazoles derived from 3,3′,4,4′-tetraaminodiphenyl ether, diphenyl esters of aliphatic and aromatic dicarboxylic acids, and ?-caprolactam were prepared by solid-phase polycondensation. The relative degree of crystallinity, imparting the plasticity to the polymers as compared to the corresponding polybenzimidazoles, was determined by X-ray phase analysis.