Preparation and Alkali Resistance Research of Cyclotriphosphazene Based Hexa‐Imidazole Compound Functionalized Addition‐Type Polynorbornene Anion Exchange Membranes DOI Open Access
Wenjun Zhang, Xiaohui He, Defu Chen

et al.

Journal of Applied Polymer Science, Journal Year: 2024, Volume and Issue: 142(13)

Published: Dec. 30, 2024

ABSTRACT Anion exchange membranes (AEMs) are extensively utilized across various domains due to their remarkable performance. Nonetheless, AEMs continue encounter significant challenges related thermal stability, alkaline and ion conductivity. Advanced molecular design the precise incorporation of functional groups pivotal for enhancing properties. In this work, norbornene monomer was produced from 5‐norbornene‐2‐methanol. One featured an extensive alkyl side chain, while other included a long bromine chain. These monomers were subsequently used synthesize diblock polynorbornene copolymer. Finally, cyclotriphosphazene based hexa‐imidazole compounds designed using crosslinked with long, flexible chains by Menschutkin reaction. The chain structure block effectively promoted phase separation, high concentration imidazole facilitated aggregation into distinct domains. As result, series anion (aPNB‐CTPP‐2MI‐x) fabricated approach demonstrated excellent ionic conductivity, alkaline, heat resistance. Notably, aPNB‐CTPP‐2MI‐1.75 membrane achieved conductivity exceeding 100 mS cm −1 at 80°C, swelling degree only 11.96%. Even after 576 h immersion in 1 M NaOH solution (80°C), remained above 86.83%.

Language: Английский

Alkaline Stability Study of Poly(Norbornene)‐Based Stereocyclic and Cross‐Linked Anion Exchange Membranes DOI

Jia Ye,

Xiaohui He, Wenjun Zhang

et al.

Journal of Applied Polymer Science, Journal Year: 2025, Volume and Issue: unknown

Published: May 3, 2025

ABSTRACT The anion exchange membrane (AEM) fuel cell has become a low‐cost next‐generation technology due to continuous research. overall properties of AEMs are significantly affected by the proper configuration cationic groups in polymer backbone. A method address relationship between equilibrium ion conductivity, mechanical strength, and stability been presented constructing unique hydrophilic hydrophobic microphase separation structures. have structure. type designed synthesized using polynorbornene diblock copolymer as main chain, 1,4‐diazabicyclo[2,2,2]octane (DABCO) cross‐linking agent, trimethylamine (TMA) quaternary ammonium salt reagent. Anion membranes with varying degrees were controlling amount agent. These named CL‐aPNB‐ x ‐DABCO‐TMA. AFM phase diagrams SAXS diagram indicated that ‐DABCO‐TMA distinct region, wider transport channel, more reliable capability. highest ionic conductivity was observed CL‐aPNB‐5%‐DABCO‐TMA, which 135.41 mS cm −1 at 80°C. After being soaked hot alkali (80°C, 1 M NaOH) for 35 days, over 83.9% initial OH − retained.

Language: Английский

Citations

0
Preparation and Alkali Resistance Research of Cyclotriphosphazene Based Hexa‐Imidazole Compound Functionalized Addition‐Type Polynorbornene Anion Exchange Membranes DOI Open Access
Wenjun Zhang, Xiaohui He, Defu Chen

et al.

Journal of Applied Polymer Science, Journal Year: 2024, Volume and Issue: 142(13)

Published: Dec. 30, 2024

ABSTRACT Anion exchange membranes (AEMs) are extensively utilized across various domains due to their remarkable performance. Nonetheless, AEMs continue encounter significant challenges related thermal stability, alkaline and ion conductivity. Advanced molecular design the precise incorporation of functional groups pivotal for enhancing properties. In this work, norbornene monomer was produced from 5‐norbornene‐2‐methanol. One featured an extensive alkyl side chain, while other included a long bromine chain. These monomers were subsequently used synthesize diblock polynorbornene copolymer. Finally, cyclotriphosphazene based hexa‐imidazole compounds designed using crosslinked with long, flexible chains by Menschutkin reaction. The chain structure block effectively promoted phase separation, high concentration imidazole facilitated aggregation into distinct domains. As result, series anion (aPNB‐CTPP‐2MI‐x) fabricated approach demonstrated excellent ionic conductivity, alkaline, heat resistance. Notably, aPNB‐CTPP‐2MI‐1.75 membrane achieved conductivity exceeding 100 mS cm −1 at 80°C, swelling degree only 11.96%. Even after 576 h immersion in 1 M NaOH solution (80°C), remained above 86.83%.

Language: Английский

Citations

1