Water-Intercalated and Humidity-Responsive Lamellar Materials by Self-Assembly of Sodium Acrylate Random Copolymers

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 14, 2025

Herein, we report water-intercalated and humidity-responsive lamellar materials obtained from the self-assembly of sodium acrylate (ANa)/alkyl or oleyl (RA) random copolymers. The copolymers efficiently absorbed water into hydrophilic ANa/main chain phase outer environment to form structures consisting segments hydrophobic side chains. formation involves controlling weight fraction containing 40–70 wt % by RA content, chains, amount water. domain spacing can be controlled in range 2–6 nm. More interestingly, reversibly afford expansion contraction sub-1 nm level via absorption release water, response relative humidity. multilayered process intercalation was analyzed situ neutron reflectometry atomic force microscopy measurements under humid conditions. polymer film further served as a moisture-sensitive actuator that macroscopically induces deformation responsive

Language: Английский

Reversible photoswitching of proton conduction in hetero‐smectic lamellar structures formed by side‐chain liquid crystalline copolymer thin films

Polymer International, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 31, 2024

Abstract Spatiotemporal control of ion conductivity is a key issue for creating emerging fields functional ion‐conducting nanomaterials. In the present paper, we demonstrate formation hetero‐smectic lamellar structures, which are formed by nanosegregation hydrophobic liquid crystalline (LC) azobenzene side chains and hydrophilic acrylic acid via polymer main in side‐chain LC (SCLC) copolymers, reversible photoswitching proton conductivity. Proton‐conducting SCLC copolymers with different contents synthesized free‐radical copolymerization. The nature polymers investigated polarized optical microscope observation, differential scanning calorimetry X‐ray scattering measurements. Ultraviolet (UV)–visible absorption spectroscopy grazing incidence measurements reveal copolymer thin films. Proton films evaluated impedance under temperatures relative humidity conditions sequential UV light irradiation. These results indicate that stable around one order magnitude attributed to trans – cis photoisomerization offer opportunity applications photo‐functional nanomaterials including biomimetic ionic signal transduction devices neuromorphic devices. © 2024 Society Chemical Industry.

Language: Английский