Hybrid anion exchange membranes with adjustable ion transport channels designed by compounding SEBS and homo‐polystyrene

Hybrid anion exchange membranes (AEMs) were prepared via chemically functionalizing and crosslinking poly(styrene‐b‐[ethylene‐co‐butylene]‐b‐styrene) (SEBS) copolymers and low molecular weight homo‐polystyrene (hPS). Via sequential chloromethylation, crosslinking, quaternization, and alkalization, a...

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Bibliographic Details
Published in:Journal of applied polymer science 2021-06, Vol.138 (23), p.n/a
Main Authors: Shi, Yue, Meng, Fanzhi, Zhao, Zhongfu, Liu, Wei, Zhang, Chunqing
Format: Article
Language:English
Subjects:
Anion exchanging
batteries and fuel cells
Copolymers
Crosslinking
Fuel cells
Ion currents
Ion transport
Ions
Lamella
Low molecular weights
Materials science
Membranes
Modulus of elasticity
Morphology
Polymers
polystyrene
Polystyrene resins
Styrenes
swelling
Swelling ratio
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Summary:Hybrid anion exchange membranes (AEMs) were prepared via chemically functionalizing and crosslinking poly(styrene‐b‐[ethylene‐co‐butylene]‐b‐styrene) (SEBS) copolymers and low molecular weight homo‐polystyrene (hPS). Via sequential chloromethylation, crosslinking, quaternization, and alkalization, a series of hPS/SEBS AEMs were obtained with varying content of hPS. Systematic structural, morphological, mechanical, absorption, and transport measurements reveal that these properties depend on the total PS content in the membranes. Particularly, increasing total PS content causes (a) PS domains in the AEMs transition the cylindrical morphology to lamella‐like morphology with comparable correlation length; (b) Young's modulus, water uptake, swelling ratio, ionic exchange capacity and ionic conductivity of the AEMs, and Tg of PS phase increase. In addition, the alkaline stability of the hPS/SEBS AEMs is also improved by addition of hPS. These findings suggest that the proposed method can develop high performance SEBS AEMs that are suitable for fuel cell applications. Hybrid anion exchange membranes (AEMs) were prepared via chemically functionalizing and crosslinking poly(styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene) (SEBS) copolymers and low molecular weight homo‐polystyrene (hPS). The performance of hPS/SEBS was systematically studied by controlling the mass ratio of hPS/SEBS. Our results show that increasing total PS content can increase the ionic exchange capacity, ionic conductivities, mechanical and chemical stability of the AEMs.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.50540