Synthesis of soluble and thermally stable poly(N -arylenebenzimidazole)s

Abstract

Six new bis(benzimidazolyl) monomers containing ether, sulfonyl and ketone groups were synthesized efficiently. A series of poly(N-arylenebenzimidazole)s were prepared using an aromatic nucleophilic displacement reaction that removed the N-H sites from the novel bis(benzimidazolyl) derivatives with activated aromatic difluorides in sulfolane. The reaction was carried out at 210• C in the presence of anhydrous potassium carbonate. All resulting polymers showed essentially amorphous patterns. This was consistent with the calculated results. Differential scanning calorimetry and thermogravimetric measurements showed that the polymers had high glass transition temperatures (>240• C), good thermostability and high decomposition temperatures (>400• C). These novel polymers also showed easy solubility.

From polybenzimidazoles to polybenzimidazoliums and polybenzimidazolides

“…The structural scope was later extended to cover a large variety of N-coupled polybenzimidazole copolymers. [195][196][197][198][199]…”

Synthesis of N-substituted poly(benzimidazole ketone ketone)s containing pyridine rings

“…Bis(benzimidazolyl) monomer was synthesized as reported previously. 28 2,6-Bis(4-fluorobenzoyl) pyridine was synthesized as reported previously. 32 Polyphosphoric acid, sulfolane, and chlorobenzene were purchased from Aladdin Chemistry Co. Ltd (Shanghai, China) and used as received.…”

Fabrication and characterization of poly(benzimidazole-amide)/functionalized titania nanocomposites containing phthalimide and benzimidazole pendent groups

“…Because of these unique properties, PBI are widely applied to fire-resistant protective gears, firemen's turnout coats, astronaut's space suits, industrial workers' suits, and circuit boards [21]. Although PBIs suffer the low processability which may diminishes their applications, but it may be improved through several structural modifications such as the incorporation of flexible bridging linkages and the introduction of bulky substituents as pendent groups along with the rigid polymer backbone [22][23][24][25][26][27]. In order to improve thermal and mechanical properties of PBI, several kinds of inorganic fillers such as silica [28,29], clay [30,31], ZnO [32], graphene oxide (GO) [33], carbon nanotube (CNT) [34,35], and polyhedral oligomeric silsesquioxane (POSS) [36] have been incorporated into the PBI matrix.…”