Poly(N-phenylenebenzimidazoles) as an alternative to classical polybenzimidazoles

Poly(N‐phenylenebenzimidazoles), a New Approach for Monomer Synthesis

“…On the other hand, the tetraamine monomers (which are expensive, toxic and unstable in storage) are widely used in PBI and other heterocyclic polymer synthesis, and, therefore, there are several well‐known methods for their preparation. The most obvious way for BisBI synthesis is heterocyclization of the tetraamines in formic acid in the presence of dilute mineral acids (Phillips reaction), this method was used in our previous work for BisBI‐O monomer synthesis . A different interesting pathway for benzimidazole synthesis was found in work of Hanan et al; it involved one‐pot reduction and cyclization of o‐nitroamines.…”

“…The obtained BisBI were tested in the polymer synthesis (Scheme ) under the similar conditions based on the method developed in our previous research . The only difference in the routine for different polymers was a varying quantity of K 2 CO 3 : 1.1x in cases of NuPBI‐O‐SO 2 and NuPBI‐SO 2 , or 2.2x for NuPBI‐SO 2 ‐SO 2 and NuPBI‐O‐CH 2 .…”

Carbon Nanofiber Paper Electrodes Based on Heterocyclic Polymers for High Temperature Polymer Electrolyte Membrane Fuel Cell

“…Polymer of intrinsic microporosity (PIM‐1) (Scheme ) was synthesized according to the method, developed by our group, which corresponds to the requirements of green chemistry . Poly(N‐phenylene‐benzimidazole) (NuPBI) was obtained according to the procedure, reported by our group . Meta‐polybenzimidazole ( m ‐PBI) was synthesized in polyphosphoric acid according to well‐known method, reported in Refs.…”

Oligomers with structural elements of imidazolidinetrione obtained from oxamic acid and oxamide: polyurethane foams modified by structural elements of imidazolidinetrione

“…Another method of preparing such polymers has been the use of substrates which allow the formation of heterocyclic rings during the polyreaction, e.g., during preparation of polyimides, polybenzthiazoles [2] or polybenzimidazoles [3][4][5][6]. In a similar way, thermally stable polymers containing parabanic acid rings in their structure (trioxoimidazolidine rings) have been obtained, e.g., with the use of isocyanate cyanoformamidyl [7]:…”

“…Another production method of polymers containing parabanic acid rings is constructing this ring by means of oxalyl chloride, which is incorporated in the structure of polymers such as polyureas [12,13]: (5) where R is the same as R 1 and R 2 in the previous reaction.…”