Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9684842 | Journal of Membrane Science | 2005 | 7 Pages |
Abstract
Novel sulfonated poly(ether ether ketone ketones) (SPEEKKs) based membranes have been prepared and evaluated for proton exchange membranes (PEMs). Directly aromatic and nucleophilic substituting polycondensation was adapted to control the sulfonated process. SPEEKKs with different sulfonated degrees were prepared by adjusting the content of sulfonated monomer. All the SPEEKKs can easily be cast into tough membranes and show high thermal stability. SPEEKKs membranes exhibit conductivities (25 °C) from 3.6 Ã 10â4 to 0.05 S/cm, (80 °C) from 0.001 to 0.06 S/cm; water swelling from 9.14 to 26.71%, ion-exchange capacities (IEC) from 0.63 to 1.57 mmol/g and methanol diffusion coefficients at 25 °C from 6.6 Ã 10â7 to 8.6 Ã 10â7 cm2/s. These diffusing coefficients are much lower than that of Nafion® (2 Ã 10â6 cm2/s) and make SPEEKK membranes with a good alternative that can reduce problems which associates with high methanol crossover in direct methanol fuel cells.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Xianfeng Li, Changpeng Liu, Hui Lu, Chengji Zhao, Zhe Wang, Wei Xing, Hui Na,