| Summary: | 博士 === 中原大學 === 化學工程研究所 === 104 === In this research, we demonstrate the C-F group of the chemical inert perfluorosulfonic acid polymers, such as Nafion, is reactive with atom transfer radical addition / atom transfer radical polymerization (ATRA/ATRP). As a macroinitiator, Nafion is reacted with sodium 4-vinylbenzenesulfonate (NaSS) and graphene oxide (GO) respectively to form the graft copolymer and organic-inorganic hybrid material by ATRP and ATRA. This two products can be acted as proton exchange membranes in the proton exchange membrane fuel cell (PEMFC) application.
In the experimental section, for proving that Nafion is able to react through ATRA or ATRP method, Nafion is reactive with copper (I) bromide (CuBr) and 2,2’-bipyridyl (BPY) by halogen exchange reaction. The analysis results of Fourier Transform Infrared Spectrometer (FTIR) show that Nafion and transition metal complex can be successfully reacted by using halogen exchange reaction, which means that Nafion is reactive by ATRA/ATRP methods. To further confirm this experiment result, Nafion, as macroinitior, is reactive with MWCNT, n-isopropyl acrylamide (NIPAAm) and styrene by ATRA, ATRP and Surface- initiated ATRP methods respectively. All the products are characterized by FTIR、XPS、Raman、TGA or 19F NMR. The results show that MWCNT-Nafion, Nafion-PNIPAAm and Nafion 212-PS are able to be composed successfully by ATRA or ATRP methods, and these results can also re-confirm that Nafion is reactive through ATRA or ATRP methods.
Then Nafion is reacted with Graphene oxide (GO) and Sodium 4-vinylbenzene sulfonate (NaSS) respectively by ATRA and ATRP methods to produce Nafion-PNaSS (graft copolymer) and GO-Nafion (organic-inorganic hybrid material). Besides some basic characterization examinations like FTIR, XPS, Raman and TGA, two kinds of proton exchange membranes (PEM) are made to test proton conductivity. The PEMs are produced by dispersing GO-Nafion and dissolving the Nafion-PNaSS respectively into the Nafion solution with different sample loadings, which are named as GO-Nafion/Nafion and Nafion-PSS/ Nafion composite membranes. In the membrane properties and proton conductivity test, as the amount of Nafion-PNaSS or GO-Nafion goes up, the composite membranes increase water uptakes capability and rise proton conductivity; however, the dimensional changes are also increasing with the rising amount of Nafion-PNaSS or GO-Nafion. Furthermore, the proton conductivities reach their highest points as the loading of the GO-Nafion and Nafion-PNaSS are 0.1% and 15% respectively. The proton conductivities of GO-Nafion_0.1% is 1.5-fold higher than Nafion_ Recast, and the PEMFC performance of GO-Nafion_0.1% is beter than Nafion 212’s. In the Nafion-PSS/Nafion complex membranes section, the proton conductivities of Nafion-PSS_15% is not only beter than Nafion 212, but twiceas much as Nafion_ Recast.
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