磺化聚醚醚酮磺化度的测定及其对质子交换膜性能的影响

以聚醚醚酮（PEEK）和浓硫酸为原料,采用后磺化法制备不同磺化度的磺化聚醚醚酮（SPEEK）。采用核磁共振法测定SPEEK的磺化度,并研究了磺化度对SPEEK质子交换膜性能的影响。结果表明：磺化度高于80％的SPEEK会发生过度溶胀,而磺化度为48％～65％范围的SPEEK膜表现出较好的质子传导率、阻醇性能及抗吸水性能。     

Characterization of SPEEK/Y2O3 proton exchange membrane treated with high magnetic field

The membranes of sulfonated poly(etheretherketone) of 48.3% sulfonation degree doped with Y2O3 were prepared, and then treated with parallel high magnetic field of 6 and 12 T at 120 oC for 4 h, respectively. The small-angle X-ray scattering revealed that the struc- ture of the composite membranes would be changed by high magnetic field treatment. The cross-section morphology of the composite membranes by a scanning electron microscope showed that the Y2O3 could be dispersed evenly in the composite membranes which were relatively smooth and compact but formed small conglomeration with increasing Y2O3 content and treating high magnetic field. The water uptake of membranes would be reduced with Y2O3 content increasing, but not be modified by the treatment of high magnetic field. The proton conductivity of membranes would be increased with temperature rising from 20 to 60 oC, and improved under high magnetic field, which could all exceed 10-2 S/cm at 75% relative humidity, but decrease with doping content of Y2O3 from 2 wt.% to 8 wt.%. The methanol permeability of the composite membranes would be decreased with Y2O3 content increasing and slightly reduced after high magnetic field treatment.