期刊
JOURNAL OF MEMBRANE SCIENCE
卷 581, 期 -, 页码 303-311出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2019.03.025
关键词
Alkaline exchange membrane; Polymeric ionic liquid; Anisotropic swelling behavior; Microphase separation
资金
- National Natural Science Foundation of China [51603017, 51673030]
- Jilin Provincial Science & Technology Department [20180101209JC, 20160520138JH, 20160519020JH]
- Jilin Province Development and Reform Commission [2019C042-5]
- Education Department of Jilin Province [JJKH20191286KJ]
- ChangBai Mountain Scholars Program of Jilin Province
Dimensionally stable and high level of conductivity is of importance for alkaline exchange membrane (AEM) applications. However, the main challenge for AEMs is to control swelling behavior and construct ion transport high way simultaneously. Here we report a series of self-crosslinked membranes using poly (aryl ether ketone) as rigid matrix and imidazolium-based polymeric ionic liquid as hydroxyl transporting groups. The obtained membranes possess anisotropic swelling behavior: no more than restricted 4% in-plane swelling ratio indicate excellent dimensional stability; while, obvious through-plane swelling guaranteed abundant water absorption in the hydrophilic domains, which benefited sufficient hydroxide ion dissociation and improved ion conductivity. The swelling ratio of through-plane can be more than tenfold of in-plane. This result quantifies the dramatic influence of flexible polymeric ionic liquid on specific swelling behavior of membranes for the first time. Moreover, the distinct microscopic phase separation endows the membranes possessing high ion conductivity (0.067 S cm(-1)). The introduction of long-chain polymeric ionic liquid not only facilitate continuous pathway, but also reduce the dependency on lambda (average hydration number vs. positive group). After treatment in alkaline conditions, the membranes still exhibit more than 8 MPa tensile strength.
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