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Quaternized poly (2,6‐dimethyl‐1,4‐phenylene oxide) crosslinked by tertiary amine and siloxane for anion exchange membranes
Author(s) -
Ding Ao,
Zhou Jinyue,
Cheng Xiangze,
Shen Chunhui,
Gao Shanjun
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50201
Subject(s) - membrane , siloxane , polymer chemistry , phenylene , thermal stability , ion exchange , tertiary amine , swelling , materials science , oxide , silsesquioxane , amine gas treating , ionic conductivity , chemical stability , chemistry , ion , organic chemistry , composite material , polymer , electrolyte , electrode , biochemistry
A series of tertiary amine and siloxane crosslinked composite anion exchange membranes were prepared by incorporating 2‐(3,4‐epoxycyclohexyl) ethyltrimethoxysilane (EHTMS) and N , N , N ′, N ′‐Tetramethyl‐1,6‐hexanediamine (TMHDA) into N ‐Methyldiethanolamine (MDEA)‐functionalized poly (2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) backbone via sol‐gel process. The resultant membranes named as AEM‐X (X = 1, 2, 3, 4), which own a three‐dimensional (3D) cross‐linking structure, exhibit superior swelling resistance, mechanical properties, even the thermal stability is up to 220°C. Compared with AEM‐1 (contains no crosslinker), the swelling ratio of AEM‐2 obviously decreases by 10.2% at 80°C, while the OH − conductivity of AEM‐2 has a merely 1.9% decline (20.6 mS cm −1 ) at 80°C and can maintain 67% of its initial value in a 2 M aqueous NaOH at 80°C for 240 h. The simultaneous introduction of inorganic siloxane and organic linear crosslinker provides a new idea for the preparation of anion exchange membranes with largely improvement in dimensional stability and alkali resistance while the ionic conductivity is kept at comparatively high level.