Abstract
New possibilities for the synthesis of high-molecular weight poly(2,5(6)-benzimidazole) (ABPBI) based on a new monomer, 3,4-diaminobenzoic acid monophosphate, in polyphosphoric acid medium at high monomer concentration under stirring and on a Teflon® surface without stirring are investigated. New complex solvent for ABPBI is found. This solvent is based on dimethyl sulfoxide, methanol, and potassium hydroxide. For the first time, molecular weight values are obtained by dynamic light scattering and viscometry in complex solvent. In addition, Kuhn segment values are estimated. Maximal molecular mass MDη value reaches 94 kDa. The values of macromolecular equilibrium rigidity A are estimated as 4.4–5.7 nm according to translational diffusion coefficient and 3.3 nm according to intrinsic viscosity measurements.
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The study was fi nancially supported by Russian Foundation for Basic Research (grant # 18-29-17062 mk (polymer and monomer synthesis) and grant # 19-33-90063 (polymer solution and molecular characteristic investi gation)).
NMR was performed with support of Ministry of Science and Higher Education of the Russian Federation using the equipment of Center for molecular composition studies of INEOS RAS.
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Ponomarev, I.I., Rybkin, Y.Y., Volkova, Y.A. et al. New possibilities for the synthesis of high-molecular weight poly(2,5(6)-benzimidazole) and studies of its solutions in DMSO-based complex organic solvent. Russ Chem Bull 69, 2320–2327 (2020). https://doi.org/10.1007/s11172-020-3036-8
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DOI: https://doi.org/10.1007/s11172-020-3036-8