Fabrication of amorphous lamellar freestanding poly(N‐dodecyl acrylamide) films and their mechanical properties DOI Creative Commons
Yuki Koizumi,

Yoshimasa Matsuo,

Akito Masuhara

и другие.

Polymer International, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 12, 2024

Abstract An amorphous lamellar freestanding film composed of poly( N ‐dodecyl acrylamide) (pDDA) was prepared by annealing a micrometer‐thick under humid conditions (humid‐annealing). pDDA blade‐coated onto glass substrate, and its formation studied XRD polarized optical microscopy (POM). The pattern indicates that formed highly oriented structure humid‐annealing at 80 °C for 6 h. Moreover, the POM image cross‐section started polymer–substrate interface, lamella covered entire area without randomly regions. In contrast, open Nicol microscopic exhibited large cracks in owing to shrinkage film. A crack‐free using water‐saturated chloroform as solvent blade coating. Water is thought adsorb an amide moiety induce ‘pre‐lamellar’ solution. pre‐lamellae decrease temperature reduced form mechanical properties crack‐free, films were simple tensile test. became increasingly stronger with structure. These results indicate polymer can be improved crystallization. © 2024 Author(s). Polymer International published John Wiley & Sons Ltd on behalf Society Chemical Industry.

Язык: Английский

Proton‐Conducting Polymers: Key to Next‐Generation Fuel Cells, Electrolyzers, Batteries, Actuators, and Sensors DOI Creative Commons
Yuki Nagao

ChemElectroChem, Год журнала: 2024, Номер 11(12)

Опубликована: Март 4, 2024

Abstract The author summarized recent diverse applications and advancements for proton‐conducting polymers since 2018, emphasizing their importance in various technological areas. These are integral to fuel cells, water electrolysis, energy storage systems, actuators, sensors, offering high proton conductivity, chemical stability, adaptability. review elucidated aspects of specific applications, highlighting roles optimizing cell efficiency enhancing electrolysis hydrogen production, improving supercapacitors batteries, explaining emerging use smart materials robotics. Additionally, the paper presented discussion latest research trends, particularly from environmental cost perspectives, specifically addressing modification these enhance functionality broaden scope application.

Язык: Английский

Процитировано

25
Molecular Dynamics Simulation of Polymer Electrolyte Membrane for Understanding Structure and Proton Conductivity at Various Hydration Levels Using Neural Network Potential DOI
Attila Táborosi, Kentaro Aoki, Nobuyuki Zettsu

и другие.

Macromolecules, Год журнала: 2025, Номер unknown

Опубликована: Март 26, 2025

Alkyl sulfonated polyimides (ASPIs), as alternative polymer electrolytes for fuel cells, are known to exhibit lyotropic liquid crystalline behavior upon water uptake, forming organized lamellar structures and achieving high proton conductivity. Previous experimental studies have shown that ASPIs with planar backbones enhanced conductivity (0.2 S/cm) compared those bent (0.03 S/cm). To explain this difference at the atomistic level, molecular dynamics simulations were conducted using a universal neural network potential. The appearance of monomer unit length in ASPIs, indicating higher order, was found correlate ASPIs. Despite similar deprotonation solvation sulfonic acid groups both independent these factors. Directional mean square displacement analysis provided further insights into differences between types.

Язык: Английский

Процитировано

0
Ion-conductive liquid-crystalline gels for enhanced soft actuator applications DOI
Chengyang Liu, Masafumi Yoshio

Materials Today Chemistry, Год журнала: 2025, Номер 46, С. 102715 - 102715

Опубликована: Апрель 22, 2025

Язык: Английский

Процитировано

0
Order-Order Transition in Statistical Copolymer Thin Film Induced by LCST-Type Behavior DOI

Mao Kikuchi,

Mitsuo Hara, Shusaku Nagano

и другие.

The Journal of Physical Chemistry B, Год журнала: 2024, Номер 128(31), С. 7681 - 7689

Опубликована: Июль 24, 2024

In this paper, we describe the formation of an ordered structure in a copolymer thin film through hydration, which subsequently transitions to different upon dehydration. A statistical poly(N-octadecyl acrylamide-stat-hydroxymethyl acrylamide) with comonomer content ratio 1:1, denoted as p(ODA50/HEAm50), was synthesized via free radical copolymerization. We prepared on solid substrate and annealed it at 60 °C under humid conditions. This treatment formed side-chain segregated lamellar (SCSegL) structure, ODA HEAm units are oriented perpendicularly polymer backbone opposite each other. Increasing annealing temperature 90 led transition mixed (SCMixL) where also but both directions. The quartz crystal microbalance (QCM) data indicate that p(ODA50/HEAm50) exhibits LCST-like behavior approximately 50 °C. conclude SCSegL is due pronounced segregation between water-adsorbed groups hydrophobic ODA. Conversely, dehydration reduces forces, forming SCMixL lower strain. These results demonstrate undergoes order-to-order driven by hydration-dehydration process. Additionally, found changes significantly alter swelling properties film.

Язык: Английский

Процитировано

2
Ion Exchange Membranes: Latest Developments toward High-Performance Vanadium Redox Flow Batteries DOI

Sooraj Sreenath,

P. S. Nayanthara,

Melinda Krebsz

и другие.

ACS Applied Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 15, 2024

Redox flow batteries (RFBs) are one of the hopes for grid energy storage applications. Among various RFBs, vanadium redox battery (VRFB) has specific advantage deploying same element, i.e., in different oxidation states both negolyte and posolyte. However, its major unmet concern is poor charge retention during cycling, attributed to cross-contamination across separator. Perfluorosulfonic acid-based cation exchange membranes (CEMs) preferred separators VRFB. Nevertheless, negatively charged matrix CEMs, redox-active species counterions easily diffuse through, leading capacity decay. To counter crossover, benefit Donnan exclusion been considered. For this reason, anion (AEMs) encouraged The positive on AEMs can effectively exclude ions, but have limitation low ionic conductivity questionable chemical stability a highly oxidative environment. In recent years, membrane research community adopted strategies ions between electrodes boost overall performance battery. review, we will focus approaches developed advancement VRFB membranes.

Язык: Английский

Процитировано

2
Magnetic field-assisted widened short-range ion channels to facilitate ion conductivity for alkaline anion exchange membrane fuel cell DOI
Haicun Yang, Xudong Ma, Wenzhong Ma

и другие.

Journal of Membrane Science, Год журнала: 2024, Номер unknown, С. 123600 - 123600

Опубликована: Дек. 1, 2024

Язык: Английский

Процитировано

2
Effects of Alkyl Side Chain Length on the Structural Organization and Proton Conductivity of Sulfonated Polyimide Thin Films DOI

Tetsuya Honbo,

Yutaro Ono,

Kota Suetsugu

и другие.

ACS Applied Polymer Materials, Год журнала: 2024, Номер 6(21), С. 13217 - 13227

Опубликована: Окт. 21, 2024

This study investigates the impact of alkyl side chain length on structural organization and proton conductivity sulfonated polyimide (SPI) thin films. SPIs with different lengths CX (X: number carbon atoms at chain, X = 0, 3, 6, 10) were synthesized, relationship between molecular architecture transport properties was investigated. In all SPIs, polymer backbone oriented parallel to substrate, lamellar structures confirmed, spacing increasing linearly length. Water uptake behavior varied significantly, where C0 film exhibited highest water lower humidity while C3 achieved higher under high humidity, reaching 1.8 × 10–1 S cm–1 298 K 95% relative (RH) an activation energy 0.18 eV 90% RH. Conversely, extending led insolubility in C10. As a result, exchange membrane system chemical/water stability constructed. These findings provide critical insights into designing advanced proton-conducting materials optimizing their performance for fuel cells other electrochemical devices.

Язык: Английский

Процитировано

1
Chain entanglement and free-volume effects in branched poly(arylene piperidinium) anion-exchange membranes: random-branched versus end-branched DOI

Jiandang Xue,

John C. Douglin, Tong Huang

и другие.

Journal of Membrane Science, Год журнала: 2024, Номер unknown, С. 123519 - 123519

Опубликована: Ноя. 1, 2024

Язык: Английский

Процитировано

1
Design of Functional Gyroid Minimal Surfaces Transporting Proton Based Solely on Surface Hopping Conduction Mechanism DOI Open Access

Nanami Aoki,

Yumin Tang, Xiangbing Zeng

и другие.

Macromolecular Rapid Communications, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 3, 2024

Abstract Surface proton hopping conduction (SPHC) mechanisms is an important mechanism in conventional polymer electrolytes, along with the Grotthuss and vehicle mechanisms. Due to small diffusion coefficient of protons SPHC mechanism, few studies have focused on mechanism. Recently, it has been found that a dense alignment SO 3 − groups significantly lowers activation energy enabling fast conduction. In this study, series polymerizable amphiphilic‐zwitterions prepared, forming bicontinuous cubic liquid‐crystalline assemblies gyroid symmetry presence suitable amounts bis(trifluoromethanesulfonyl) imide (HTf 2 N) water. situ polymerization these compounds yields gyroid‐nanostructured films, as confirmed by synchrotron small‐angle X‐ray scattering experiments. The high conductivity films order 10 −2 S cm −1 at 40 °C relative humidity 90% based solely

Язык: Английский

Процитировано

0
Fabrication of amorphous lamellar freestanding poly(N‐dodecyl acrylamide) films and their mechanical properties DOI Creative Commons
Yuki Koizumi,

Yoshimasa Matsuo,

Akito Masuhara

и другие.

Polymer International, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 12, 2024

Abstract An amorphous lamellar freestanding film composed of poly( N ‐dodecyl acrylamide) (pDDA) was prepared by annealing a micrometer‐thick under humid conditions (humid‐annealing). pDDA blade‐coated onto glass substrate, and its formation studied XRD polarized optical microscopy (POM). The pattern indicates that formed highly oriented structure humid‐annealing at 80 °C for 6 h. Moreover, the POM image cross‐section started polymer–substrate interface, lamella covered entire area without randomly regions. In contrast, open Nicol microscopic exhibited large cracks in owing to shrinkage film. A crack‐free using water‐saturated chloroform as solvent blade coating. Water is thought adsorb an amide moiety induce ‘pre‐lamellar’ solution. pre‐lamellae decrease temperature reduced form mechanical properties crack‐free, films were simple tensile test. became increasingly stronger with structure. These results indicate polymer can be improved crystallization. © 2024 Author(s). Polymer International published John Wiley & Sons Ltd on behalf Society Chemical Industry.

Язык: Английский

Процитировано

0