Synthesis of Holey-polybenzimidazole (HPBI)

Abstract

After Nobel Prize winning discovery of graphene in physics in 2004, two-dimensional structure grew rapidly due to outstanding thermal, physical, and electronic properties. Especially, two-dimensional nanoporous crystalline polymers (2D NPC) were concentrated due to their interesting robust structure, flexibility, and high surface area. Zeolite and metal organic frameworks (MOFs) as typical NPC have been studied showing huge potential in gas storage, catalyst, and electronic devices. However, the metallic source causes a drop of efficiency and durability as well as high cost. Hence, covalent organic frameworks (COFs) composed of organic component came to the forefront again. Most pristine 2D COFs synthesized so far with sp3 bond are sensitive to moisture and high temperature. Therefore, we synthesized holey-polybenzimidazole (HPBI) which is well-matched with theoretical structure via condensation reaction using two types of amino benzenes as monomer. Based on the hole size, they show different surface properties and band gap.