Amorphous-to-crystalline transformation toward controllable synthesis of fibrous covalent organic frameworks enabling promotion of proton transportElectronic supplementary information (ESI) available: Materials and methods, Fig. S1-S15, and Tables S1 and S2. See DOI: 10.1039/c8cc08590k

Reversible imine exchange is adopted to molecularly re-arrange polyazomethine-based amorphous fibers into covalent organic frameworks (COFs) retaining pristine fibrous characters with periodic and oriented micropore channels. Such fibrous COFs can immobilize the assembled Nafion to form long-range proton conduction pathways, thus largely promoting proton transport. Reversible imine exchange is adopted to transform amorphous polyazomethine into fibrous crystalline covalent organic frameworks that are able to immobilize Nafion for enhanced proton transport.