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Wang J.,Shandong Dongyue Polymer Materials Co. | Yang M.-K.,Shandong Dongyue Polymer Materials Co. | Zhang H.,Shandong Dongyue Polymer Materials Co. | Zhang Y.-M.,Shanghai JiaoTong University
Gongneng Cailiao/Journal of Functional Materials | Year: 2014

The perfluorinated ion exchange membrane (PFIEM) was the crucial materials in the proton exchange membrane fuel cell (PEMFC) and chlor-alkali industry, which widely used in the fuel cell, chlor-alkali industry, vanadium battery, etc. As one of the key components, the structure and properties of the PFIEM determine the performance of the battery or cell. Annealing was a kind of traditional technological process, which was simple and convenient, being widely used in the research of the PFIEM performance. In this review, according to different properties of the ionic membrane, we mainly outline the annealing effect of perfluorinated ion exchange membranes on the proton conductivity, methanol permeability, mechanical properties, permselectivity, etc., respectively. The characteristics of the research at present and developing directionare summarized. ©, 2014, Journal of Functional Materials. All right reserved.

Wang J.,Shandong Dongyue Polymer Materials Co. | Yang M.,Shandong Dongyue Polymer Materials Co. | Dou P.,Shandong Dongyue Polymer Materials Co. | Wang X.,Shandong Dongyue Polymer Materials Co. | Zhang H.,Shandong Dongyue Polymer Materials Co.
Industrial and Engineering Chemistry Research | Year: 2014

Perfluorosulfonate ion-exchanged membranes (PFSIEMs) have been prepared by the melt-extrusion method. Subsequently, the effect of annealing on the properties of PFSIEMs was studied. Attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) analysis suggested that -SO3 - groups could be brought to the membrane surface, presumably by side chain movement during the course of thermal annealing. In the presence of coexisting ion clusters and crystallization, area resistance increased with the rise of the treatment temperature. X-ray diffraction (XRD) analysis further showed that the annealing treatment should increase the crystallinity of membranes, markedly. The equivalent weight (EW) and water uptake were also employed to evaluate the effect of annealing on membranes. For membranes prepared by melt extrusion, abnormal fluctuations are solely evident in the thermogravimetric (TG) traces of annealed specimens. In addition, two glass transition temperatures, ca. 120 and ca. 250 °C, have been observed in the differential scanning calorimetry (DSC) analysis. When the thermal annealing temperature was increased, however, the lower endothermic peak shifted to the high temperature region, mostly because water molecules can serve as the plasticizer to reduce Tg. In addition, we also found that the dynamic mechanical property of membranes can be substantially impacted by annealing. Changes in the temperature relaxation have been explored with dynamic mechanical analysis (DMA). © 2014 American Chemical Society.

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