The present invention relates to the field of cationic polymers, and in particular, to highly alkali-stable poly(arylene alkylene piperidinium) cationic polymers and preparation methods and applications. The preparation method for the highly alkali-stable poly(arylene alkylene piperidinium) cationic polymers includes the following steps: performing catalytic polycondensation on 1-R.sup.6-piperidine-3-carboxaldehyde or a salt or hydrate thereof and an aromatic compound to obtain a polymer having a piperidine moiety; and then further subjecting the polymer to a quaternization reaction to obtain the poly(arylene alkylene piperidinium) cationic polymer. The anion exchange membranes prepared from the piperidinium-based cationic polymers have ultra-high alkaline stability and excellent mechanical properties and ionic conductivities, and can be applied to the fields of electrochemical energy conversion such as fuel cells, hydrogen production by water electrolysis, electrochemical reduction of carbon dioxide, flow batteries, and fields of separation such as electrodialysis and water treatment.

The present invention relates to the field of cationic polymers, and in particular, to highly alkali-stable poly(arylene alkylene piperidinium) cationic polymers and preparation methods and applications. The preparation method for the highly alkali-stable poly(arylene alkylene piperidinium) cationic polymers includes the following steps: performing catalytic polycondensation on 1-R.sup.6-piperidine-3-carboxaldehyde or a salt or hydrate thereof and an aromatic compound to obtain a polymer having a piperidine moiety; and then further subjecting the polymer to a quaternization reaction to obtain the poly(arylene alkylene piperidinium) cationic polymer. The anion exchange membranes prepared from the piperidinium-based cationic polymers have ultra-high alkaline stability and excellent mechanical properties and ionic conductivities, and can be applied to the fields of electrochemical energy conversion such as fuel cells, hydrogen production by water electrolysis, electrochemical reduction of carbon dioxide, flow batteries, and fields of separation such as electrodialysis and water treatment.

The present disclosure relates to the field of cationic polymers, and in particular to highly alkali-stable poly(arylene alkylene piperidinium) cationic polymers having branched structures, and the preparation method and application thereof. The highly alkali-stable poly(arylene alkylene piperidinium) cationic polymers having branched structures include one or more of a central unit, a linear unit L.sub.1, and a linear unit L.sub.2, where the central unit includes one or more of an MA unit, a piperidinium group (m-DMP) and a CA unit, the linear unit L.sub.1 includes the piperidinium group (m-DMP) and a BA unit, and the linear unit L.sub.2 includes a BA unit and a CA unit. The disclosure employs the aforementioned steps to enhance the intermolecular interactions and increase the molecular weight of the polymer through a branching strategy.

The present disclosure relates to the field of cationic polymers, and in particular to highly alkali-stable poly(arylene alkylene piperidinium) cationic polymers having branched structures, and the preparation method and application thereof. The highly alkali-stable poly(arylene alkylene piperidinium) cationic polymers having branched structures include one or more of a central unit, a linear unit L.sub.1, and a linear unit L.sub.2, where the central unit includes one or more of an MA unit, a piperidinium group (m-DMP) and a CA unit, the linear unit L.sub.1 includes the piperidinium group (m-DMP) and a BA unit, and the linear unit L.sub.2 includes a BA unit and a CA unit. The disclosure employs the aforementioned steps to enhance the intermolecular interactions and increase the molecular weight of the polymer through a branching strategy.