Abstract: 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-R6-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.

Abstract: 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 L1, and a linear unit L2, where the central unit includes one or more of an MA unit, a piperidinium group (m-DMP) and a CA unit, the linear unit L1 includes the piperidinium group (m-DMP) and a BA unit, and the linear unit L2 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.

Abstract: A dual antibacterial, hemostatic, bio-based polyurethane hydrogel containing natural antibacterial components is provided. The hydrogel is prepared using a one-step, solvent-free, catalyst-free method. The raw materials include: biodegradable polyester polyol; polyethylene glycol; bio-based diisocyanate; a hydrophilic alcohol chain extender; curcumin; glycerol; deionised water; and Panax notoginseng extract. In the hydrogel: Curcumin promotes the physical and chemical crosslinking of the polyurethane hydrogel, improving its antioxidant and antibacterial properties. The active components of Panax notoginseng saponins are loaded into the hydrogel via hydrogen bonding between the sulfonic acid group, the carboxyl group on the polyurethane molecular chain, and the saponins. This gives the hydrogel hemostatic and antibacterial properties. At the same time, the hydrogel releases the drug slowly when it absorbs weakly alkaline wound exudate.

Abstract: The present invention introduces ionic polymers featuring with a spiro structure, which enhances the solubility and gas permeability of the ionic polymer while maintaining excellent conductivity, mechanical properties, and dimensional stability. This is achieved by incorporating a spiro fragment with a large free volume into the polymer backbone. As a result, the gas permeability of the catalyst layer prepared from this ionic polymer is improved, making it suitable as a catalyst binder for proton exchange membrane fuel cells (PEMFCs) or anion exchange membrane fuel cells (AEMFCs). Furthermore, the electrochemical performance of the fuel cell is enhanced. Additionally, the proton exchange membrane and anion exchange membrane derived from this ionic polymer containing a spiro structure effectively improve the conductivity of both types of membranes by increasing the space volume due to the presence of the large free volume spiro fragment.

Abstract: The present invention discloses a preparation method of highly alkali-stable cationic polymers, including the following steps: placing a polymerization mixture comprising 1-R1-3-piperidinone or its salts or hydrate thereof and arene monomers in a first organic solvent, performing catalytic polycondensation by adding organic strong acids, and obtaining a polymer dispersion with piperidine moieties; slowly dropping the dispersion of the polymer with piperidine moieties into a first precipitant, and obtaining a polymer powder with piperidine moieties after drying; dissolving the polymer powder with piperidine moieties of in a second organic solvent, after adding the quaternization reagent, obtaining a cationic polymer solution.

Abstract: A lost reminder method of a smart key includes performing a plurality of steps with a mobile device. The plurality of steps includes: periodically determining whether the smart key is connected to the mobile device via the Bluetooth at a preset time period, outputting a reminder message when the smart key is not connected to the mobile device via the Bluetooth, and selectively updating the preset time period according to a set instruction in response to the reminder message.

Abstract: The present invention introduces ionic polymers featuring with a spiro structure, which enhances the solubility and gas permeability of the ionic polymer while maintaining excellent conductivity, mechanical properties, and dimensional stability. This is achieved by incorporating a spiro fragment with a large free volume into the polymer backbone. As a result, the gas permeability of the catalyst layer prepared from this ionic polymer is improved, making it suitable as a catalyst binder for proton exchange membrane fuel cells (PEMFCs) or anion exchange membrane fuel cells (AEMFCs). Furthermore, the electrochemical performance of the fuel cell is enhanced. Additionally, the proton exchange membrane and anion exchange membrane derived from this ionic polymer containing a spiro structure effectively improve the conductivity of both types of membranes by increasing the space volume due to the presence of the large free volume spiro fragment.

Abstract: The present invention discloses a preparation method of highly alkali-stable cationic polymers, including the following steps: placing a polymerization mixture comprising 1-R1-3-piperidinone or its salts or hydrate thereof and arene monomers in a first organic solvent, performing catalytic polycondensation by adding organic strong acids, and obtaining a polymer dispersion with piperidine moieties; slowly dropping the dispersion of the polymer with piperidine moieties into a first precipitant, and obtaining a polymer powder with piperidine moieties after drying; dissolving the polymer powder with piperidine moieties of in a second organic solvent, after adding the quaternization reagent, obtaining a cationic polymer solution.