氧化钛纤维改性PEM的性能研究

Study on Properties of PEM Modified by Titanium Oxide Fiber

采用传统碱性水热法制备了末端开口、中空的氧化钛纤维(TNTs),将其掺杂进SPEEK基体,制备了SPEEK/TNTs复合膜。利用SEM、XRD和FTIR检测TNTs的微观形貌、晶型、稳定性,并系统地研究了不同掺杂量TNTs对复合膜质子电导率和吸水率(WU)的影响程度及规律。结果显示:水热法制备的TNTs属于亚稳态结构,较高的比表面积和高长径比的形态结构使纤维极易团聚,这导致TNTs的加入对复合膜的质子电导率产生了负面影响。同时,亲水性TNTs的加入使复合膜的吸水率提升,室温下SPEEK/TNT-5的吸水率(WU)达到24.1%,与SPEEK(WU=20.4%)相比提升了18.1%。

Titanium oxide fibers(TNTs) with open ends and hollow structure were prepared by alkaline hydrothermal method. TNTs were doped into SPEEK matrix to prepare SPEEK/TNTs composite membrane. The micro morphology,crystal form and stability of TNTS were detected by SEM,XRD and FTIR. Furthermore, the influence of doping amounts of TNTs on the proton conductivity and water uptake(WU) of the composite membrane was studied. The results showed that, TNTs prepared by hydrothermal method had metastable structure. The high specific surface area and one-dimensional structure made TNTs easy to agglomerate. Thus, the addition of TNTs exhibited the negative effect on the proton conductivity of SPEEK/TNTs composite membranes. While, the addition of TNTs with hydrophilicity significantly improved the WU of the composite membrane. The WU of SPEEK/TNT-5 was 21.4%,which was 18.1% higher than pure SPEEK(WU=20.4%).