Fabrication and wet spinning of a fully aromatic meta-polybenzimidazole

Abstract

High reduced viscosity meta-polybenzimidazole (mPBI) as well as high-strength fibers of this polymer were fabricated via solution polycondensation and wet spinning, and the content of phosphorus pentoxide (P 2 O 5 ) in the solvent, the reaction period and the draw ratio were altered. The results indicate that the reduced viscosity of the polymer reached a maximum of 2.75 dL g À1 with 82 wt% P 2 O 5 in the solvent, and the reaction period was 8 h. The polymer displayed good solubility and excellent thermal stability. At a coagulation bath concentration, polymer reduced viscosity and stretch ratio of 61.5 wt%, 2.75 dL g À1 and 1.87, respectively, mPBI fibers that had relatively smooth surfaces and almost circular cross sections were formed (minimum diameter of 138 mm and maximum breaking strength of 306 MPa). In addition, the fibers exhibited good dimensional and chemical stability.

Graphene-Fiber-Based Supercapacitors Favor N-Methyl-2-pyrrolidone/Ethyl Acetate as the Spinning Solvent/Coagulant Combination

“…In addition, Konios et al also suggested that NMP with high dipole moments and close surface tension to the GO surface energy exhibits the highest solubility and significant long-term stability, being the most efficient solvents for the dispersion of GO among organic systems . NMP is widely used as solvent for polymer wet spinning. , Until now, the most reported wet-spun GO fibers are H 2 O based, ,− and a few are DMF based , and chlorosulfonic acid based . No comparison on the structure, properties, and electrochemical performance of rGO-Fs derived from various spinning-dope solvents has been explored so far.…”

“…40 NMP is widely used as solvent for polymer wet spinning. 41,42 Until now, the most reported wet-spun GO fibers are H 2 O based, 35,43−46 and a few are DMF based 47,48 and chlorosulfonic acid based. 49 No comparison on the structure, properties, and electrochemical performance of rGO-Fs derived from various spinning-dope solvents has been explored so far.…”

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

“…[ 11–13 ] The polymerization methods of PBI contain melt polycondensation, solution polycondensation, and nucleophilic substitution. [ 14 ] One common synthetic route is solution polycondensation using the diacid and tetra‐amine monomers. [ 6,15–17 ] The reaction solvents include polyphosphoric acid (PPA), Eaton's reagent, N , N ‐dimethylacetamide (DMAc), and N , N ‐dimethylformamide (DMF), [ 14,18 ] and PPA is used most often since it can absorb water of the by‐product.…”