Poly[2,6‐(1,4‐phenylene)‐benzobisimidazole] Nanofiber Networks

Abstract

The preparation of poly[2,6‐(1,4‐phenylene)‐benzobisimidazole] (PPBI) nanofibers was examined using the crystallization of oligomers during isothermal polymerization of self‐polymerizable 2‐(1,4‐carbophenoxyphenyl)‐5,6‐diaminobenzimidazole. The polymerization was carried out at 350 °C at a concentration of 1wt.‐% for 6 h in three kinds of solvent. The solvent influenced the morphology of PPBI precipitates significantly, and PPBI nanofiber networks were successfully formed in DBT, of which the width ranged from 30 to 110 nm. Molecules were aligned along the long axis of nanofibers. A fibrillar morphology with molecular orientation is ideal for high performance materials such as reinforcements, non‐woven fabrics and so on. The nanofiber networks exhibit the highest thermal stability.

Preparation and characterization of graphene oxide/poly(vinyl alcohol) composite nanofibers via electrospinning

“…Polymer‐based composites come in different forms, among which nanofibers are of particular interests due to a big variety of important applications 10, 23. The general fabricating methods of polymer‐based composite nanofibers are electrospinning,10 self‐assembly,24 phase separation,25 and nanoporous template 26. The electrospinning process, patented in 1934 by Formhals,27 is a very important technique for making nanofibers, because of its simplicity and flexibility in producing homogeneous fibers with adjustable diameter and microstructure with various nanofillers.…”

Morphology control of various aromatic Polyimidazoles—preparation of nanofibers

“…This method is not limited by the processability of polymers. In our previous works, the morphology control of the following four aromatic polyimidazoles had been examined by the reaction‐induced crystallization during polymerization; poly[2,2′‐(1,3‐phenylene)‐5,5′‐bibenzimidazole], poly[2,2′‐(1,4‐phenylene)‐ 5,5′‐bibenzimidazole], poly[2,6‐(1,4‐phenylene)‐benzobisimidazole], and poly(2,5‐benzimidazole) 34–37. Among them the latter three polyimidazoles afforded the nanofibers.…”