https://orbit.dtu.dk/files/4351774/2009%20PBI%20review%20Progress%20in%20Polymer%20Science%2034,%205,%20449-477.pdf

High temperature proton exchange membranes based on polybenzimidazoles for fuel cells

The present invention relates to composite solid polymer electrolyte membranes (SPEMs) which include a porous polymer substrate interpenetrated with an ion-conducting material. SPEMs of the present invention are useful in electrochemical applications, including fuel cells and electrodialysis.

Composite solid polymer electrolyte membranes

The flame retardant thermoplastic resin composition according to the present invention comprises (A) about 45 to 95 parts by weight of a polycarbonate resin; (B) about 1 to 50 parts by weight of a rubber modified vinyl graft copolymer; (C) about 0 to 50 parts by weight of a vinyl copolymer; (D) about 1 to 30 parts by weight of a mixture of oligomeric phosphoric acid ester compounds consisting of (dl) about 5 to 99 % by weight of an oligomeric phosphoric acid ester compound derived from bisphenol-A and (d2) about 1 to 95 % by weight of an oligomeric phosphoric acid ester compound derived from resorcinol, per 100 parts by weight of the sum of (A), (B) and (C); and (E) about 0.05 ~ 5 parts by weight of a fluorinated polyolefin resin, per 100 parts by weight of the sum of (A), (B) and (C).

Flame retardant thermoplastic resin composition

Pressure-sensitive adhesive tape having a photopolymerized acrylate polymer adhesive which has been crosslinked by a polyacrylic-functional crosslinking monomer such as trimethyol-propane triacrylate.

Multiacrylate cross-linking agents in pressure-sensitive photoadhesives

A method for preparing polybenzimidazole or polybenzimidazole blend membranes and fabricating gas diffusion electrodes and membrane-electrode assemblies is provided for a high temperature polymer electrolyte membrane fuel cell. Blend polymer electrolyte membranes based on PBI and various thermoplastic polymers for high temperature polymer electrolyte fuel cells have also been developed. Miscible blends are used for solution casting of polymer membranes (solid electrolytes). High conductivity and enhanced mechanical strength were obtained for the blend polymer solid electrolytes. With the thermally resistant polymer, e.g., polybenzimidazole or a mixture of polybenzimidazole and other thermoplastics as binder, the carbon-supported noble metal catalyst is tape-cast onto a hydrophobic supporting substrate. When doped with an acid mixture, electrodes are assembled with an acid doped solid electrolyte membrane by hot-press. The fuel cell can operate at temperatures up to at least 200 °C with hydrogen-rich fuel containing high ratios of carbon monoxide such as 3 vol% carbon monoxide or more, compared to the carbon monoxide tolerance of 10-20 ppm level for Nafion®-based polymer electrolyte fuel cells.

Polymer electrolyte membrane fuel cells

A novel heat-curable acrylic-terminated monomer is provided which exhibits an optically anisotropic melt phase at a temperature which enables it to undergo melt processing in the formation of molded articles, etc. Subsequent to melt processing articles prepared from the monomer are capable of being cured to produce a thermoset self-reinforced composite which is soft and flexible relative to prior art monomers. The monomer may, for example, consist essentially of the reaction product of a methacrylic-substituted phenol and terephthalic acid.

Anisotropic heat-curable acrylic terminated monomers

An improved acid interchange polymerization process for the formation of an aromatic polyester is provided. Ester and carboxylic acid functional groups are reacted in the presence of a catalytically effective amount of a catalyst consisting of a mixture of a transition metal salt of a strong inorganic acid and a transition metal salt of an aliphatic carboxylic acid containing up to about 4 carbon atoms. In a preferred embodiment of the process the reactants are at least one aromatic diester and at least one aromatic dicarboxylic acid. Alternatively, the ester and carboxylic acid functional groups required for the acid interchange reaction may be provided upon the same molecule. Halogen or other substituent groups which do not interfere with the acid interchange reaction optionally may be present upon the aromatic rings.

Acid interchange polymerization process for producing an aromatic polyester

This invention provides an improved process for producing alkyl ethers of polygalactomannan gum by contacting polygalactomannan gum with alkyl halide in the presence of a metal hydroxide catalyst and a quaternary ammonium phase-transfer agent.

Process for production of polygalactomannan ethers

PHOSPHOROUS-CONTAINING POLYESTER MOLDING RESIN COMPOSITIONS HAVING IMPROVED FLAME RETARDANT PROPERTIES WHEREIN SAID POLYESTER COMPOSITIONS COMPRISE MELT BLENDS OF A REINFORCING AGENT, A SYNTHETIC LINEAR POLYPROPYLENE TEREPHTHALATE OR POLYBUTYLENE TEREPHTHALATE, AND UP TO ABOUT 30 PERCENT, BASED ON THE WEIGHT OF POLYESTER, OF A POLYPHOSPHONATE OR POLY(PHOSPHONATE-PHOSPHATE) HAVING A THE FOLLOWING GENERAL FORMULA. R1-((-P(=O)(-R)-O-AR1-Z1-)Q-(-P(=O)(-OR3)-O-AR2-Z1-)R)X-Z2 WHEREIN R1 IS A MONOVALENT RADICAL HAVING UP TO ABOUT 20 CARBON ATOMS SELECTED FROM THE GROUP CONSISTING OF ALKOXY, ARYLOXY, HYDROXY, HALOALKOXY, HALOARYLOXY, HYDROXYALKOXY, AND HYDROXYARYLOXY; R2 IS A MONOVALENT RADICAL HAVING UP TO 20 CARBON ATOMS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL, ARYL, HALOALKYL, AND HALOARYL; R3 IS A MONOVALENT RADICAL HAVING UP TO 20 CARBON ATOMS SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, HALOALKYL AND HALOARYL; AR1 AND AR2 ARE DIVALENT RADICALS EACH HAVING UP TO ABOUT 20 CARBON ATOMS INDEPENDENTLY SELECTED FROM THE GROUP CONSISTING OF ARYLENE AND HALOARYLENE; Z1 IS A DIVALENT RADICAL SELECTED FROM THE GROUP CONSISTING OF ALKYLENE, ARYLENE, HALOALKYLENE, HALOARYLENE, OXY, THIO, AND SULFONYL, Z2 IS EITHER HYDROGEN OR -P(=O)(-R2)-R1 Q IS AN INTEGER OF AT LEAST 1; R IS 0 OR AN INTEGER OF AT LEAST 1; X IS GREATER THAN 1. THE MOST PREFERRED POLYPHOSPHONATE IS POLY(M-PHENYLENE PHENYLPHOSPHONATE). THE MOST PREFERRED COPOLYMER IS POLY(M-PHENYLENE PHENYLPHOSPHATE)Q(M-PHENYLENE PHENYLPHOSPHONATE)R) WHERE Q/R IS GREATER THAN 3.

Phosphorus-containing polyesters

A substituted polybenzimidazole polymer is disclosed wherein sulfoalkyl derivatives of polybenzimidazole are produced by the reaction of a polybenzimidazole polymer with a sultone. Beta sultones may be directly reacted with the polybenzimidazole polymer to produce a sulfoethyl derivative of polybenzimidazole. However, when gamma, delta or eta sultones are used, the polybenzimidazole polymer preferably is first reacted with an alkali hydride to produce the polyanion of polybenzimidazole. The polybenzimidazole polyanion is then reacted with the sultone to produce a sulfoalkyl derivative of polybenzimidazole polymer. These derivatives may find great use as ion exchange devices or for reverse osmosis or ultrafiltration devices.

Robert W. Stackman

Papers

Anisotropic heat-curable acrylic terminated monomers

Acid interchange polymerization process for producing an aromatic polyester

Process for production of polygalactomannan ethers

Phosphorus-containing polyesters

Sulfoalkylation of polybenzimidazole