Fabrication of Ultrahigh‐Strength Polybenzimidazole Fibers via a Novel and Green Integrated Liquid Crystal Spinning Process

Abstract

Herein, the first example of ultrahigh‐strength polybenzimidazole (PBI) fibers using a PBI solution in liquid crystal state is reported via a novel and green integrated spinning technology. Microwave‐assisted polycondensation is utilized to synthesize the polybenzimidazole/polyphosphoric acid liquid crystal spinning solution and pure water is employed as the coagulating and washing bath to afford a green fabrication process. The green integrated spinning technology is eco‐friendly, cheap, and conducive for the large‐scale production of PBI fibers. The as‐prepared PBI fibers display superb flame retardancy, and the outstanding thermal stability of PBI fiber enables it to preserve structural integrity at temperatures as high as 600 °C. More significantly, it prepared the ultrahigh‐strength of PBI fiber up to 0.91 GPa, which is two times than that of the reported PBI fibers, marking a significant breakthrough for the high‐performance PBI fibers.

Preparation of High-Temperature Resistant Polyimide Fibers by Introducing the p-Phenylenediamine into Kapton-Type Polyimide

“…The research interest in high-temperature resistant materials is increasing driven by their potential applications in demanding environments with thermal runaway, as well as high- and low-temperature cycling. − Various heat-resistant materials, such as poly­( p -phenylenebenzobis-oxazole) (PBO) fibers, , polybenzimidazole (PBI) fibers, , aramid fibers, , polyimide fibers, − glass fibers, carbon fibers, , and basalt fibers, have been developed and used widely. Nevertheless, the fibers mentioned above encounter several shortcomings during practical use.…”

Enhanced mechanical performance of cellulose nanocrystal doped eco-friendly calcium-alginate based bio-composite fiber with superior flame retardancy

“…Environmentally friendly material for fire-fighting uniforms, with good flame retardancy, fabric comfort, and light weight, is increasingly in demand, and would ensure its utilization in special operational conditions. 1,2 Current fire-fighting clothes are mostly fabricated using petroleum-based synthetic fibers such as polybenzimidazole fiber, 3 Nomex fiber, 4 and polytetrafluoroethylene fiber, 5 or are treated with a flame-retardant finishing agent, [6][7][8] which can cause unnecessary heavy weight and irritating tickling. Therefore, addressing existing hurdles would not only increase wear comfort for the fire-fighter, but also reduce the problems caused by the fire-resistant finish.…”