Abstract:
To provide: a block copolymer that exhibits excellent proton conductivity even under low-humidification conditions, exhibits excellent mechanical strength and chemical stability, and when used in a polymer electrolyte fuel cell, allows high output and excellent physical durability; a polymer electrolyte material; and a polymer electrolyte form article and a polymer electrolyte fuel cell, using the same.The block copolymer of the present invention includes each one or more of: a segment (A1) containing an ionic group; a segment (A2) not containing an ionic group; and a linker moiety connecting the segments. The segment (A1) containing an ionic group comprises a constituent unit represented by a specific structure. The polymer electrolyte material, the polymer electrolyte form article, and the polymer electrolyte fuel cell according to the present invention are manufactured by using the above block copolymer.
Abstract:
The present invention provides an electrode catalyst layer comprising catalyst particles, an ion exchange resin and a water repellent agent. The water repellent agent contains (A) a fluorine-containing copolymer having a structure unit derived from a polyfluoroalkyl-containing (meth)acrylate and/or (B) a fluorine-containing copolymer having a structural unit represented by derived from a fluorine-containing olefin monomer and a structure unit represented derived from a vinyl ether monomer. The electrode catalyst layer contains 0.1 to 20% by weight of the water repellant agent. The electrode catalyst layer exhibits excellent balance between water retention and drainage in an electrode, good power generation performance under any of low humidity and high humidity conditions, and also excellent durability in power generation.
Abstract:
A polyelectrolyte material includes as a main chain: a benzene ring; an ether; and a carbonyl group. A part of the benzene ring is sulfonated. A method for manufacturing a polyelectrolyte material includes: synthesizing disulfonyl difluorobenzophenone; and polymerizing the disulfonyl difluorobenzophenone, 4,4′-difluorobenzophenone, and phenolphthalein with a crown ether as a catalyst. The synthesizing is performed by reacting 4,4′-difluorobenzophenone with fuming sulfuric acid, performing salting-out the reaction product, and recrystallizing the salting-out product.
Abstract:
To provide: a block copolymer that exhibits excellent proton conductivity even under low-humidification conditions, exhibits excellent mechanical strength and chemical stability, and when used in a polymer electrolyte fuel cell, allows high output and excellent physical durability; a polymer electrolyte material; and a polymer electrolyte form article and a polymer electrolyte fuel cell, using the same.The block copolymer of the present invention includes each one or more of: a segment (A1) containing an ionic group; a segment (A2) not containing an ionic group; and a linker moiety connecting the segments. The segment (A1) containing an ionic group comprises a constituent unit represented by a specific structure. The polymer electrolyte material, the polymer electrolyte form article, and the polymer electrolyte fuel cell according to the present invention are manufactured by using the above block copolymer.
Abstract:
This invention provides a new, biomass-derived glycol, bis(2-hydroxyethyl)isosorbide, which is found to be a valuable monomer for a wide variety of polymeric materials
Abstract:
Bis(halophthalimides) such as, 3-bis[N-(4-chlorophthalimido)]benzene are prepared in slurry in an organic liquid such as o-dichlorobenzene or anisole, by a reaction at a temperature of at least 150° C. between at least one diamino compound, preferably an aromatic diamine such as m- or p-phenylenediamine, and at least one halophthalic anhydride such as 4-chlorophthalic anhydride, in the presence of an imidization catalyst such as sodium phenylphosphinate. The solids content of the reaction mixture is at least about 5% and preferably at least about 12% by weight. The product slurry may be employed directly in the preparation of polyetherimides, and similar slurries may be employed to prepare other polyether polymers.
Abstract:
A composition having the structure ##STR1## wherein --R' is --F or --Cl, each --R", which may be the same or different, is independently selected from the group consisting of C.sub.1 -C.sub.6 alkyl or hydroxyalkyl moieties and aryl moieties, and n is 1 or 2. These compositions are useful as co-monomers or end-cappers for the introduction of thermally reactive cross-linking sites into polymers.
Abstract:
What are disclosed are aromatic polyethers which are resistant to high temperature, having a reduced viscosity greater than 0.25 dl/g and a repeating structural unit[(A-O).sub.a (B-O).sub.b (C-O).sub.c ],wherein A is 5a,10b-diphenyl-coumarano[2',3',2,3]coumaran of the formula ##STR1## B has the formula ##STR2## wherein n is 0 or 1, and X is ##STR3## and/or ##STR4## and C is at least one further aromatic unit.
Abstract:
The disclosed polymers are prepared from the interaction of a difunctional alkali metal phenate and a dihalide. At least some of the dihalide should be an aliphatic compound containing an oxetane (oxacyclobutane) ring attached to a carbon of the aliphatic chain. Up to 90 mole percent of the dihalide can, however, be an aromatic dihalide containing an electronwithdrawing group substituted on the aromatic nucleus, e.g., a sulfone group. The resulting oxetane-containing polymers can be crosslinked by reactions similar to those used to crosslink epoxy resins.
Abstract:
The invention relates to a process for producing semi-aromatic polyethers based on an aliphatic diol, to semi-aromatic polyethers based on an aliphatic diol obtained by said process, and to the use of said semi-aromatic polyethers based on an aliphatic diol for manufacturing membranes, manufactured parts and coatings.