側(cè)鏈型磺化聚芳醚酮Nafion改性劑的制備及Nafion復(fù)合膜的性能研究
[Abstract]:By adjusting the ratio of the hydrophilic side chain sulfonyl structure to the hydrophobic all aromatic main chain structure in the polymer body, A side chain sulfonyl poly (aryl ether ketone) proton exchange membrane (SNPAEK-xx) with only a single naphthyl group in the main chain repeat unit structure was prepared, in which the side chain sulfonyl naphthalene polyaryl ether ketone proton exchange membrane (SNPAEK-xx) was prepared. The SNPAEK-xx membrane with sulfonation degree higher than 1.30 showed excellent proton conductivity. At 80 oC, the proton conductivity was higher than 0.145S cm-1, and the maximum proton conductivity was up to 0.191 S cm-1,. The proton conductivity of Nafion membrane is better than that of Nafion membrane under the same conditions. Based on SNPAEK-xx polymers with different sulfonation degrees, the properties of side chain sulfonyl naphthyl poly (aryl ether ketone) proton exchange membrane materials were studied. In the proton exchange membrane materials, the interaction between the unique groups of planar naphthyl groups is helpful to the aggregation of hydrophobic phase regions, and thus to the formation of more obvious hydrophilic phase separation structures. The interaction of naphthyl groups among molecular chains can also improve the chemical stability of the membrane materials, enhance the mechanical properties of the membrane materials, and reduce the water absorbency of the membrane materials, based on the special action of the planar naphthyl groups. The bisnaphthyl poly (aryl ether ketone) proton exchange membrane (SDN-PAEK-x) containing two naphthyl groups in the main chain repeat unit structure was further prepared. The proton conductivity of the proton exchange membrane material was greatly improved. The results of the battery performance showed that the SDN-PAEK-1.94 proton exchange membrane material with binaphthyl structure had significantly better performance than that of the Nafion membrane. The maximum power density at 40 oC can reach 32 MW cm~ (-2), which is obviously superior to the maximum power density of 24 MW cm~ (-2) at 80 oC of Nafion film. At the same time, the maximum power density of SDN-PAEK-1.94 film at 80 oC is 60 MW cm~ (-2), which is obviously better than that of Nafion film under the same condition. It can be used as a potential proton exchange membrane material for direct methanol fuel cells. Taking into account the difference in comprehensive properties and the cost of preparation of SNPAEK-xx with a single naphthyl group and SDN-PAEK-x sulfonated polymer with a bisnaphthyl group in the repetitive unit structure of the prepared polymer chain, Firstly, a series of Nafion/SNPAEK-x composite membranes with different mass content of SNPAEK-1.35 polymers were prepared by using SNPAEK-1.35, which has good comprehensive properties and relatively low cost, as Nafion modifier and Nafion. The effect of SNPAEK-1.35Nafion modifier on the comprehensive properties of Nafion membrane was investigated. The results showed that the introduction of SNPAEK-1.35 polymer modifier in Nafion composite membrane could improve the proton conductivity of Nafion membrane. The effects of alcohol resistance and cell performance in methanol system and other properties of Nafion film were improved to some extent.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2017
【分類號(hào)】:TQ425.236
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