光谱分析在含1，3，4-噁二唑环质子交换膜领域中的应用

Spectroscopy Analysis Application on Proton Exchange Membrane with 1,3,4-Oxadiazole

采用直接缩聚的方法,通过调节磺化单体与非磺化单体的比例合成出一系列含有1,3,4-噁二唑的聚芳醚砜聚合物。并且通过红外光谱,核磁共振谱,热失重分析仪对其结构进行验证。红外光谱在1 603cm-1出现了CN的特征吸收峰,验证了噁二唑环的结构,又经1 H NMR进一步验证了其聚合物的结构,说明已经成功在聚合物中引入了1,3,4-噁二唑环。热失重有两个明显的失重平台,在300和450℃分别为磺酸基团和聚合物骨架的断裂,展现了良好的热性能,满足作为质子交换膜的基本要求。

A series of novel Sulfonted poly（arylene ether sulfone）s （SPAES） containing 1,3,4-oxadiazole are prepared via direct polycondensation reactions to precisely control the degree of sulfonation. The structures of these compounds were confirmed by FTIR, H-NMR and TGA. The characteristic peaks of transmittances spectra of C=N were found at 1 603 cm^-1 and by H-NMR further confirm the structures, which has been successful introducing the oxadiazole ring. In each TGA curve can observe two distinct weight loss steps, which the one at 300℃and the second at 450 ℃ were mainly attributed to the splitting-off of sulfonic acid groups and decomposition of the main chain of the SPAES. The TGA exhibit excellent thermal properties may be satisfied with the basic requirements of proton exchange membrane （PEM） for fuel cells.