State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, China.
ACS Appl Mater Interfaces. 2016 Aug 10;8(31):20329-41. doi: 10.1021/acsami.6b04590. Epub 2016 Jul 26.
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-Cn) 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-Cn membranes. The ionic conductivity of QSEBS-Cn 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-Cn 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 × 10(4) S·s·cm(-3) at 60 °C due to its low methanol permeability.
苯乙烯-丁二烯-苯乙烯嵌段共聚物（SEBS）被选择进行功能化和交联反应，以制备阴离子交换膜。通过氯甲基化 SEBS 与 α，ω-二官能仲胺的同时季铵化和交联，合成了交联季铵化 SEBS（QSEBS-Cn）膜。二胺中间隔基-（CH2-）n 的长度确实影响了功能化、微观形态和所得 QSEBS-Cn 膜的性能。与未交联的 QSEBS 相比，随着交联结构中间隔基长度从-（CH2-）增加到-（CH2）6-，QSEBS-Cn 膜的离子电导率大大增加，甲醇阻力略有降低。与 QSEBS 相比，QSEBS-Cn 膜具有更高的机械性能、使用温度、化学稳定性和热稳定性。此外，还可以原位制备 QSEBS-C6 与 0.5%氧化石墨烯的混合复合膜。由于其较低的甲醇渗透率，该混合膜在 60°C 时具有 2.0×10(-2)S·cm(-1)的相对较高离子电导率和 7.6×10(4)S·s·cm(-3)的高选择性。
