A novel polyfluorene-based ionomer, an anion exchange membrane, a method for preparing the polyfluorene-based ionomer, and a method for fabricating the anion exchange membrane are proposed. The polyfluorene-based ionomer contains no aryl ether bonds in the polymer backbone and includes piperidinium groups incorporated into the repeating units. The anion exchange membrane is fabricated from the polyfluorene-based ionomer. The anion exchange membrane has good thermal and chemical stability, excellent mechanical properties, and high ion conductivity. Due to these advantages, the anion exchange membrane can be applied as a membrane for an alkaline fuel cell and to a binder for an alkaline fuel cell or water electrolysis.

A processing method of a base material sheet includes winding out the base material sheet wound up by a first core and a first porous sheet wound up by a second core, winding up by a third core the base material sheet and the first porous sheet to be overlapped with each other, and processing the base material sheet by a first processing liquid held in the first porous sheet; and winding out the base material sheet and the first porous sheet overlappingly wound up by the third core, winding up the first porous sheet by the second core, and winding up the base material sheet by the first core.

A polymerizable composition for forming an ion-exchange resin precursor, the polymerizable composition containing a monomer component and polyethylene particles in an amount of 50 to 120 parts by mass per 100 parts by mass of the monomer component, wherein the monomer component contains an aromatic monomer for introducing ion-exchange groups and a nitrogen-containing aliphatic monomer, the nitrogen-containing aliphatic monomer being present in an amount of 10 to 35% by mass in said monomer component. An ion-exchange membrane is produced by applying the polymerizable composition onto a polyolefin type filament base material and polymerizing the polymerizable composition to form an ion-exchange resin precursor and, thereafter, introducing ion-exchange groups into the precursor.

A cationic copolymer comprises the divalent monomer units: wherein: each Ar.sup.1 independently represents phenylene; each L independently represents a direct bond or wherein each R.sup.1 independently represents an alkyl group having 1 to 4 carbon atoms, and each R.sup.2 independently represents an alkylene group having from 1 to 6 carbon atoms, and each Z.sup.− represents a non-interfering anion; each Ar.sup.2 independently represents an optionally substituted divalent aryl ring, with the proviso that if L represents a direct bond, then Ar.sup.2 represents an optionally substituted cationic divalent aryl ring accompanied by Z; each R.sup.3 independently represents H or an alkyl group having 1 to 6 carbon atoms; and each D independently represents a direct bond or Ar.sup.2, wherein adjacent D and L are not both direct bonds, and wherein if L is a direct bond, then D is Ar.sup.2. The cationic copolymer can be free-radially cured and used in a membrane.

A bipolar membrane in which a cation-exchange membrane and an anion-exchange membrane are joined to each other, wherein a leakage ratio of gluconic acid at 60° C. is not more than 1.0%, and the cation-exchange membrane is supported by a polyolefin reinforcing member and, further, contains a polyvinyl chloride.

A monolithic organic porous ion exchanger having a continuous skeleton and continuous pores, wherein the continuous skeleton is formed of an organic polymer being a hydrolysate of a crosslinked polymer of a (meth)acrylic acid ester and divinylbenzene, the organic polymer having any one or both of a —COOH group and a —COONa group as ion-exchange groups, the continuous skeleton has a thickness of 0.1 to 100 μm, the continuous pores have an average diameter of 1.0 to 1000 μm, the monolithic organic porous ion exchanger has a total pore volume of 0.5 to 50.0 mL/g, and has a total ion-exchange capacity of the —COOH group and the —COONa group per weight in a dry state of 4.0 mg equivalent/g or more.

An anion exchange membrane is composed of a copolymer of 1,1-diphenylethylene and one or more styrene monomers, such as 4-tert-butylstyrene. The copolymer includes a backbone substituted with a plurality of ionic groups coupled to phenyl groups on the backbone via hydrocarbyl tethers between about 1 and about 7 carbons in length. High-temperature conditions enabled by these copolymers enhance conductivity performance, making them particularly suitable for use in anion exchange membranes in fuel cells, electrolyzers employing hydrogen, ion separations, etc. The properties of the membranes can be tuned via the degree of functionalization of the phenyl groups and selection of the functional groups, such as quaternary ammonium groups. Several processes can be used to incorporate the desired ionic functional groups into the polymers, such as chloromethylation, radical bromination, Friedel-Crafts acylation and alkylation, sulfonation followed by amination, or combinations thereof.

A fluorine-containing polymer achieving both low resistivity and high thermal stability, which have been conventionally conflicting, a cation exchange membrane including the fluorine-containing polymer, and an electrolyzer including the cation exchange membrane. The cation exchange membrane including: the fluorine-containing polymer, which includes: a tetrafluoroethylene unit (A); and a perfluoroethylene unit (B) having a carboxylic acid-type ion exchange group, where the fluorine-containing polymer has a main-chain terminal structure (T) represented by the following formula (1):
—(C.sub.mF.sub.nH.sub.2m−n)—OH   (1) in which m and n each represent any integer satisfying m≥2, n≥0, and 2m−n≥1.

Cationic polymers are provided that comprise monomeric units of Formula (V). (V) Each asterisk (*) indicates an attachment position to another monomeric unit; R is hydrogen or methyl; each R.sup.2 is each independently an alkyl, aryl, or a combination thereof; L is a linking group comprising an alkylene group; and +R.sup.3 is a cationic nitrogen-containing group free of any N—H bonds. Membranes formed from said cationic polymers, devices including such membranes, and methods of making such cationic polymers are also provided.

##STR00001##

This invention relates to an an-ion exchange membrane and method for making said membrane. The membrane being intended for use in electrolysers or other AEM electrochemical devices. The membrane comprises: a thermoplastic elastomer (TPE) comprising styrene, said TPE being a polymeric backbone, wherein: the styrene content of the thermoplastic elastomer is between 30 wt % and 70 wt %, and crosslinking of a first polymeric backbone to one or more other polymeric backbones, and one or more cationic groups, and the functionalisation degree is between 1% and 50%.