Title of Paper:
P(VDF-co-TrFE-co-CTFE)-g-SPS共聚物的合成与表征
Summary:
Proton exchange membrane fuel cells (PEMFC) have attracted considerable research interest for its advantages in cleaning energy such as no pollution and no warm house gas. Although the mostly investigated Nafion series products possess excellent properties, their low conductivity at high temperature and low humidity as well as their high cost is still limiting their application. In this work, a series of P(VDF-co-TrFE-co-CTFE)-g-SPS copolymer with tunable graft densities and branch lengths is synthesized using commercial P(VDF-co-CTFE) via a route including partial hydrogenation, ATRP and sulfonation reaction. The structure and properties of these polymers are carefully characterized with NMR, TEM, water uptake and proton conductivity measurement. The influence of test condition and polymer construction on their properties has been well discussed. It has been shown that the graft density is governing the phase separation of the resultant polymer therefore its water uptake and proton conductivity. The copolymer with low graft densities shows larger scale phase separation, higher water uptake and larger conductivity at low temperature. As temperature increases, the proton conductivity of the copolymer with low graft density increases. The copolymer with optimized composition exhibits even higher proton conductivity at a relative humidity of over 50% than that of Nafion-112 tested in the same condition, which is expected to be an excellent PEM materials with low cost.
Co-author:
Shaobo Tan, Qinghao Yang, Zhicheng Zhang*
Papers
