期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 35, 页码 23321-23330出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b06426
关键词
poly(4-methyl-1-pentene); anion exchange membranes; phase separation; anion conductivity; alkaline stability
资金
- National Natural Science Foundation of China [21404084, 51532003, 21474126, 21504101]
- Fundamental Research Funds for the Central Universities [B040307]
- Hundred Talents Program of the Chinese Academy of Sciences
Highly anion-conductive polymer electrolyte membranes with excellent alkaline stabilities for fuel cell applications were prepared. Thus, a series of polyolefin copolymers with poly(4-methyl-1-pentene) (PMP) moieties containing bulky side chains and side-chain quaternary ammonium (QA) groups were prepared through copolymerization with a Ziegler-Natta catalyst and subsequent quaternization. The separation of hydrophilic microphase and hydrophobic microphase was induced by PMP bulky side chains, and then well-connected ionic domains were formed. This result was confirmed by AFM (atomic force microscopy) and SAXS (small-angle X-ray scattering) analyses. It was discovered that well-defined ionic domains of the PMP-TMA-x (TMA, trimethylamine) membranes depended on the content of PMP moieties. The well-defined ionic domains enhanced the hydroxide conductivity of the PMP-TMA-x membranes despite their lower water uptake (WU) as compared to polypropylene (PP)-containing membranes (PP-TMA-x). The PMP-TMA-41 membrane showed the highest ionic conductivity value (43 mS/cm) while maintaining low WU (29.2 wt %) at room temperature. The membranes mostly preserved (>93.0%) their initial hydroxide conductivity after alkaline treatment (10 M aqueous NaOH, 80 degrees C, 700 h), thereby revealing desirable alkali stability characteristics. Presumably, the nucleophilic attack from hydroxide or water in the cationic center is inhibited by long alkyl spacers (-CH2-)(n) (n = 9) which are located between the cation groups and the polymer backbone.
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