Cross-Linked Quaternized Poly(styrene-b-(ethylene-co-butylene)-b-styrene) for Anion Exchange Membrane: Synthesis, Characterization and Properties

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• 作者：Pei Dai ; Zhao-Hua Mo ; Ri-Wei Xu ; Shu Zhang ; Yi-Xian Wu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：8
• 期：31
• 页码：20329-20341
• 全文大小：784K
• 年卷期：0
• ISSN：1944-8252

文摘

Poly(styrene-b-(ethylene-co-butylene)-b-styrene) triblock copolymer (SEBS) was selected for functionalization and cross-linking reaction to prepare the anion exchange membrane. The cross-linked quaternized SEBS (QSEBS-C_n) membranes were synthesized by simultaneous of quaternization and cross-linking of chloromethylated SEBS with α,ω-difunctional tertiary amines. The spacer groups of (−CH₂−)_n in diamines did affect the functionalization, micromorphology and properties of the resulting QSEBS-C_n membranes. The ionic conductivity of QSEBS-C_n membranes greatly increased and methanol resistance slightly decreased with increasing the length of spacer groups in the cross-linked structures from −(CH₂)– to −(CH₂)₆–. Compared to the un-cross-linked QSEBS, the QSEBS-C_n membranes behaved much higher mechanical property, service temperature, chemical stability and thermal stability. Moreover, the hybrid composite membrane of QSEBS-C₆ with 0.5% of graphene oxide could also be in situ prepared. This hybrid membrane had both relatively high ionic conductivity of 2.0 × 10^–2 S·cm^–1 and high selectivity of 7.6 × 10⁴ S·s·cm^–3 at 60 °C due to its low methanol permeability.