侧链磺化聚醚醚酮质子交换膜的制备及研究
作者:郭宇星,沈春晖,高山俊,张林
单位: 武汉理工大学材料科学与工程学院,武汉 430070
关键词: 磺化聚醚醚酮,质子交换膜,溶胀度,质子电导率
分类号: TM911.48
出版年,卷(期):页码: 2020,40(4):34-40

摘要:
为进一步提高磺化聚醚醚酮质子交换膜的尺寸稳定性、耐氧化性和质子电导率,本论文从侧链结构出发设计制备了一种新的侧链型磺化聚醚醚酮质子交换膜。以磺化聚醚醚酮为聚合物主链,利用N,N′-羰基二咪唑(CDI)的活化作用将1-乙醇胺(MEA)与磺酸基团反应,从而延长侧链长度,再通过1,3-丙磺酸内酯的开环反应引入磺酸功能基团,最后采用溶胶凝胶法制备出一系列新的侧链型磺化聚醚醚酮质子交换膜。对所制备的侧链型磺化聚醚醚酮质子交换膜分别进行了结构和性能表征。结果表明,该类侧链型磺化聚醚醚酮质子交换膜中产生了亲水/疏水相分离结构,并且具有适当的吸水率和较低的溶胀度(9.2%),最大离子交换容量可达1.666mmol/g。该类质子交换膜具有更高的质子电导率,其中60℃时支化程度为80%的侧链型磺化聚醚醚酮质子交换膜的电导率高达0.096 S/cm。此外,制备的侧链型磺化聚醚醚酮质子交换膜也具有良好的机械性能,氧化稳定性和热稳定性。
A series of novel side-chain-type proton exchange membranes (AEMs) composed of sulfonated polyetheretherketone backbone and pendent sulfonic acid groups were prepared via sulfonation, activation , and ring-opening reactions. Using sulfonated polyether ether ketone as the main chain of the polymer, the activation of N, N′-carbonyldiimidazole (CDI) was used to react 1-ethanolamine (MEA) with a sulfonic acid group to extend the side chain length. A ring-opening reaction of 1,3-propane sultone introduced sulfonic acid functional groups, and finally a series of new side chain sulfonated polyetheretherketone proton exchange membranes were prepared by the sol-gel method. The structure and performance of the side chain sulfonated polyetheretherketone proton exchange membranes were characterized respectively. The chemical structure of theas-synthesized copolymers was confirmed by 1H-NMR spectroscopy. The results indicated that the side chain sulfonated polyetheretherketone proton exchange membranes displayed moderate water absorption and low swelling ratio with the values in the range of 8.9% ? 11.3%. These proton exchange membranes also showed good ionic conductivity, in which the SCSPEEK proton membrane with a degree of branching of 80% reached a proton conductivity of 0.096 mS / cm at 80 ° C. The highest ion exchange capacity of the proton membrane has been reached 1.666mmol/g. Moreover, these membranes had good thermal and mechanical property and chemical oxidative stability.

基金项目:
国家自然科学基金(基金号21875176),国家自然科学基金(基金号21276202)

作者简介:
第一作者简介:郭宇星(1995-),男,湖北省武汉市,硕士研究生,研究方向为燃料电池关键材料,E-mail:62739497@qq.com *通讯作者,E-mail:shenchunhui@whut.edu.cn

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