Controllable sulfonation of aromatic poly(arylene ether ketone)s containing different pendant phenyl rings

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• 作者：Zhiliang Li ; Xincai Liu ; Danming Chao ; Wanjin Zhang
• 关键词：Sulfonation ; Proton exchange membrane ; Proton conductivity ; Direct methanol fuel cell
• 刊名：Journal of Power Sources
• 出版年：2009
• 出版时间：5 September 2009
• 年：2009
• 卷：193
• 期：2
• 页码：477-482
• 全文大小：480 K

文摘

The sulfonation selectivity of various pendant phenyl groups in poly(arylene ether ketone) (Ph-3F-PAEK) is invested via the postsulfonation approach. The sulfonated Ph-3F-PAEKs with different degrees of sulfonation (DS) are quantitatively synthesized by controlling the length of the segments that cannot be sulfonated. In this study, ¹H NMR and FT-IR are used to confirmed the structures of the polymers and the experimentally DS values were calculated by ¹H NMR. The experimentally observed DSs are corresponding to the theoretical values expected from the monomer ratios. All the sulfonated membranes have excellent mechanical properties (with a Young's modulus >1.3 GPa, a tensile strength >55 MPa and the elongation >10 % ). Thermogravimetric analysis (TGA) is used to characterized the thermal stability of these polymers, and all the polymers show excellent thermal properties at high temperatures. The methanol permeability values of Ph-3F-SPAEKs in the range of 0.37 × 10⁻⁷ cm² s⁻¹ to 4.12 × 10⁻⁷ cm² s⁻¹ are much lower than that of Nafion^® 117 (1.55 × 10⁻⁶ cm² s⁻¹). It should be noted that the polymer with highest DS, Ph-3F-SPAEK-100 with an ion exchange capacity of 2.16 mequiv. g⁻¹, exhibits high proton conductivity of 0.187 S cm⁻¹ at 80 °C, which is also higher than that of Nafion^® 117.