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Poly[2,2-(m-phenylene)-5,5-bibenzimidazole](mPBI)were synthesized by mixing 3,3’,4,4’-tetraaminobiphenyl and isophthalic acid in 1-butyl-3-methylimidazolium chloride([BMIM]Cl).Intrinsic viscosity of mPBI polymers was 0.67 dL/g which was measured in 96%sulfuric acid.The polymer was characterized by Fourier transform infrared spectroscopy(FTIR),nuclear magnetic resonance(1H-NMR),and thermogravimetric analysis(TGA).The effects of polymerization conditions on the intrinsic viscosity of mPBI were investigated.It showed that the molecular weight of polymer mainly depended on pre-reaction time and reaction temperature.Comparison of structure and properties of mPBI synthesized in ionic liquids(ILs)and polyphosphoric acid was also reported.It indicates that the ionic liquids are a kind of good solvents in synthesis process of mPBI and ionic liquids mainly affect molecular weight of mPBI.
Poly [2,2- (m-phenylene) -5,5-bibenzimidazole] (mPBI) were synthesized by mixing 3,3 ’, 4,4’- tetraaminobiphenyl and isophthalic acid in 1-butyl-3-methylimidazolium chloride BMIM] Cl) .Intrinsic viscosity of mPBI polymers was 0.67 dL / g which was measured in 96% sulfuric acid. The polymer was characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1H-NMR), and thermogravimetric analysis ( TGA). The effects of polymerization conditions on the intrinsic viscosity of mPBI were investigated. It showed that the molecular weight of the polymer mainly depended on pre-reaction time and reaction temperature. Comparison of structure and properties of mPBI synthesized in ionic liquids (ILs) and polyphosphoric acid was also reported .It indicates that the ionic liquids are a kind of good solvents in synthesis process of mPBI and ionic liquids mainly affected molecular weight of mPBI.