PBI polybenzimidazole

Exposure medium Exp. medium note Cone. (%) Temp. (°C) Time (days) PDL Resistance note % Change Test note Materiai note 

Acetic Acid 10 93 1 9 No effect Chemical Celazole U60 Eloechst Celanese 

Celazole U60 Eloechst Celanese Specimen Tensile and compression test specimen 

Acetic Acid (cont) 10 93 30 6 Small effect Chemical resistance per ASTM D543 Celazole U60 Hoechst Celanese Specimen Tensile and compression test specimen 

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Polybenzimidazole (PBI) Fibers. Poly(2,2 -(y -phenylene)-5,5 -bisbenzimidazole) [25734-65-0] is a textile fiber marketed by Hoechst-Celanese (11) which does not form Hquid crystalline solutions due to its bent meta backbone monomeric component. PBI has exceUent resistance to high temperature and chemicals. 

PA-4,6 synthesis from, 171-172 PA-6,6 polymerization from, 169-170 PA-6,1 synthesis from, 181 PA salt solution, polymerization from, 164 Pawlow, James H., 431 PBIs. See Polybenzimidazoles (PBIs)... 

Poly(arylene thioether)s, 363-364 Poly(arylene thioether sulfone)s, 364 Poly(aryl sulfone) derivatives, 354 Poly(p-benzamide), synthesis of, 188-189 Polybenzimidazoles (PBIs), 265 ferrocene-containing, 315 synthesis of, 313... 

Polyazo dyes, 9 363—361 Polybenzamide, 15 109-110 Poly(p-benzamide) (PBA), 10 212 19 714 crystal lattice parameters of, 19 728t laboratory synthesis of, 19 719 Polybenzimidazole (PBI), asbestos substitute, 3 3141 Polybenzimidazole (PBI) fibers,... 

Other Reactive Oligomers - In the mid 1960 s, a reactive oligomeric precursor to a polybenzimidazole (PBI) was available as... 

For cells working at low and moderate temperatures, thermoplastics could have openings for components such as membranes and plates. Polybenzimidazole (PBI), LCPs and PPS could be suitable for these applications. 

Polybenzimidazole (PBI) is an infusible thermoplastic, perhaps the most advanced polymer from the thermal and mechanical points of view but, on the other hand, processing is the monopoly of its producer. 

Benicewicz, B. C., Yu, S., Xiao, L. and Perry, K. 2007. Advances in polybenzimidazole (PBI) membrane materials. In Advances in materials for proton exchange membrane fuel cell systems, Pacific Grove, CA, Feb. 18-21. 

Many heterocyclic polymers have been produced in an attempt to develop high-temperature-resistant polymers for aerospace applications. Among these are the polybenzimidazoles (PBIs), which are prepared from aromatic tetramines and esters of dicarboxylic acids (structure 4.63). In standardized procedures, the reactants are heated to below 300°C forming soluble prepolymer, which is converted to the final insoluble polymer by further heating ... 

Polyimides are obtained from amine and carboxyl reactants when the ratio of amine to acid functional groups is 1 2. If reactants with the reverse ratio of amine to acid functional groups are employed, polybenzimidazoles (PBI) are produced for instance, polymerization of 3,3 diaminobenzidine and diphenyl isophthalate yields poly[(5,5 -bi-liT-benzimidazole]-2,2 -diyl)-l,3-phenylene] (Lilia) (Eq. 2-216) [Buckley et al., 1988 Hergenrother, 1987 ... 

Chen DH, Chen YP, Arnold CA, Hedrick JC, Graybeal JD, McGrath JE (1989) Compatible blends of segmented polyimide siloxane copolymers with engineering thermoplastics I polybenzimidazole (PBI). 34th International SAMPE Symposium 1247... 

In contrast to the preceding examples, polybenzimidazole (PBI 12a) resins couple an outstanding thermooxidative stability with a pronounced affinity for the active Mo complexes (241-243). 

Several other fibrous materials have been produced, but they are regarded as fibers with special performance characteristics, used either in limited textile or in specialized industrial applications. Some of these worth noting are Spandex (1959), Aramid (1961), polybenzimidazole (PBI) (1983), and Sulfar (1983). 

Poly-2-2 -(w-phenylene)-5,5 -bibenzimidazole, commonly called polybenzimidazole (PBI), was developed under the aegis of the U.S. Air Force Materials Laboratory in cooperation with the then-existing Celanese Corporation. The fiber went into commercial production in the United States in 1983. It is a condensation polymer obtained from the reaction of tetra-aminobiphenyl and diphenylisophthalate in a nitrogen atmosphere at temperatures that may reach 400°C in the final stages.29 The structure of a repeating unit is shown below. 

Savadogo, O. and Xing, B., Hydrogen/oxygen polymer electrolyte membrane fuel cell (PEMFC) based on acid-doped polybenzimidazole (PBI), J. New Mater. Electrochem. Syst., 3, 345, 2000. 

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