A process for the preparation of a semifinished product including a PAEK-based resin and reinforcing fibers, including the stages of: a. preparation of a dispersion including a PAEK-based resin in the pulverulent form dispersed in an aqueous phase including a surfactant; b. bringing the reinforcing fibers into contact with said aqueous dispersion; c. drying the fibers impregnated with dispersion; and d. heating the impregnated fibers to a temperature sufficient for the melting of the resin, so as to form a semifinished product, wherein the surfactant is a thermally stable surfactant. Also, semifinished products capable of being obtained from the process and their use in the manufacture of composite materials.

A nitrogen-containing branched polymer, an anion exchange membrane, and a method for preparing an anion exchange resin are provided. A molecular structure of the nitrogen-containing branched polymer includes a nitrogen-containing heterocycle, a branched structure, and an aryl group. The number of branching site of the branched structure is not less than 3. The aryl group is connected to the branching site of the branched structure through the nitrogen-containing heterocycle. The aryl group and the branched structure satisfy a relationship: A:B=80-99:1-20. A polydispersity index of the nitrogen-containing branched polymer is not greater than 2.6. A weight-average molecular weight of the nitrogen-containing branched polymer is in a range of 40,000 g/mol-500,000 g/mol.

An anion exchange membrane is made by mixing 2 trifluoromethyl ketone [nominal] (1.12 g, 4.53 mmol), 1 biphenyl (0.70 g, 4.53 mmol), methylene chloride (3.0 mL), trifluoromethanesulfonic acid (TFSA) (3.0 mL) to produce a pre-polymer. The pre-polymer is then functionalized to produce an anion exchange polymer. The pre-polymer may be functionalized with trimethylamine in solution with water. The pre-polymer may be imbibed into a porous scaffold material, such as expanded polytetrafluoroethylene to produce a composite anion exchange membrane.

Polymers for use as an Anion Exchange Membranes (AEMs) and produce an alkaline stable AEM. The multinuclear aromatic and amine-functionalized acetal (ketal) come together to form a polymer with a hydrocarbon backbone that is stable to alkaline conditions. The use of an amine-functionalized acetal allows for the incorporation of a stable cation, dimethyl piperidinium, in the most stable confirmation while avoiding incorporation of a CF3 group with every cation. The amines within the amine-functionalized polyaromatic that results from this polymerization are quaternized to form the desired cationic groups to create an AEM that is mechanically robust, conductive, and stable.