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论文类型：期刊论文

发表时间：2017-08-07

发表刊物：JOURNAL OF MATERIALS CHEMISTRY A

收录刊物：SCIE、EI、Scopus

卷号：5

期号：29

页面范围：15038-15047

ISSN号：2050-7488

摘要：A novel alkaline group, hexamethylenetetramine (HMTA) with four tertiary amine groups and beta-hydrogenabsent structure, has been employed as mono-quaternization reagent to prepare HMTA mono-quaternized polysulfone anion exchange membranes (PSF-QuOH AEMs). Analyzed by molecular dynamics simulations, mono-quaternized HMTA shows a superior aggregating ability by strong electrostatic interaction with hydroxide to suppress water swelling even at high IECs. In particular, the PSF-QuOH membrane with a high IEC of 2.23 mmol g(-1) exhibits a low swelling ratio of 21% even at 60 degrees C. The resulting high concentration of cationic groups and the interactions between multiple hydrogen atoms in HMTA and hydroxide/water are helpful to induce the formation of the continuous and efficient hydrogen-bond networks, promoting ionic transport. High hydroxide conductivity of 35 mS cm(-1) is achieved at 20 degrees C. Excellent swelling resistance also benefits the mechanical and chemical stabilities of the PSF-QuOH membranes. A considerable mechanical strength of 17.7 MPa is observed in the fully hydrated membrane. The hydroxide conductivity is stable at around 86% of the initial value after 1 M KOH immersion at 60 degrees C for 168 h.