Indexed by:
期刊论文
First Author:
Gong, Xue
Correspondence Author:
Wu, XM; He, GH (reprint author), Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Res & Dev Ctr Membrane Sci & Technol, Dalian 116024, Peoples R China.
Co-author:
Yan, Xiaoming,Li, Tiantian,Wu, Xuemei,Chen, Wanting,Huang, Shiqi,Wu, Yao,Zhen, Dongxing,He, Gaohong
Date of Publication:
2017-02-01
Journal:
JOURNAL OF MEMBRANE SCIENCE
Included Journals:
SCIE、EI
Document Type:
J
Volume:
523
Page Number:
216-224
ISSN No.:
0376-7388
Key Words:
Anion exchange membrane; Ether-containing spacer; Micro-phase
separation; Hydroxide conductivity; Dimensional and alkaline stability
Abstract:
A novel approach is proposed to design anion exchange membranes (AEMs) containing pendent imidazolium side chains with flexible ether-containing spacer by the Williamson etherification between chloromethylated polysulfone and as-synthesized hydroxyl-bearing imidazolium. The introduction of long flexible ether-containing spacer chains enhances the mobility of terminated imidazolium groups and ion interactions. It facilitates the formation of a good hydrophilic/hydrophobic micro-phase separation structure, which is confirmed by the scattering peak of SAXS. As a result, the membranes exhibit high conductivity and excellent anti-swelling ability. The membrane with IEC of 1.55 mmol g(-1) shows considerable hydroxide conductivity (72 mS cm(-1), 60 degrees C), low swelling ratio (7.3%, 60 degrees C), and great tensile strength in hydrated state (43.4 MPa, 20 degrees C). The existence of long spacer chain also improved the alkaline stability. After immersion in 60 degrees C, 1 M KOH solution for 168 h, hydroxide conductivity and tensile strength of the membrane remain constant. The ether-containing side chains fabricated in this work provides a universal promising method to balance hydroxide conductivity and dimensional and alkaline stability.
Translation or Not:
no
