磷酸掺杂磺化聚(氟化亚芳基醚)-聚(环氧乙烷)共混膜的制备研究

Preparation of Phosphoric Acid-Doped Sulfonated Poly(Fluorinated Arylene Ether)-Poly(Ethylene Oxide)Co-Blend Membrane

为提高聚合物电解质膜燃料电池(PEMFC)的高温性能(150℃以上),采用磺化的聚芳基醚(SDF-F)和聚环氧乙烷(PEO)合成了新的共混膜,并使用磷酸掺杂;对新的共混膜进行了表征,并通过测量拉伸强度确定了酸掺杂共混膜的机械强度。结果表明,SDF-F和PEO成功共聚成共混膜且2种聚合物均匀混合,共混膜的磷酸掺杂水平随着PEO含量的增加而增加,当PEO的质量分数为60%时,掺杂的磷酸质量分数可达784%;共混膜的机械强度随着PEO含量的增加而下降,但即便PEO的质量分数为60%时,共混膜的拉伸强度仍有17 MPa。新共混膜能够完全满足高温聚合物电解质膜燃料电池的要求。

The new blend membrane was synthesized using the sulfonated poly(fluorinated arylene ether)s(SDF-F)and poly(ethylene oxide)(PEO)and then doped with phosphoric acid in order to operate polymer electrolyte membrane fuel cell(PEMFC)at high temperature above 150℃.The new blend membranes were characterized and the mechanical strength of acid-doped blend membranes was obtained by measuring tensile strength.The results show that SDF-F and PEO were successfully copolymerized into a blend membrane and the two polymers were uniformly mixed.The phosphoric acid doping level of the blend membrane increased with the increase of PEO content.When the mass fraction of PEO was 60%,the doped phosphoric acid mass fraction could reach 784%.The mechanical strength of the blend film decreases with the increase of PEO content,but even when the mass fraction of PEO is 60%,the tensile strength of the blend film is still 17 MPa.The new blend membrane can fully meet the requirements of high temperature polymer electrolyte membrane fuel cell.