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Hwang J.-M.,Organic Material Synthesis Laboratory | Gye B.,Organic Material Synthesis Laboratory | Kim T.-H.,Organic Material Synthesis Laboratory | Kim T.-H.,Incheon National University
Bulletin of the Korean Chemical Society | Year: 2015

Terminally crosslinked, highly sulfonated poly(arylene ether sulfone) (csPES) block copolymers with a network structure were prepared by heat-induced crosslinking of the allyl-terminated telechelic sulfone polymers using a bisazide. The block copolymers in different hydrophilic and hydrophobic compositions were fully characterized by 1H NMR. With their highly sulfonated block copolymer structure and terminally crosslinked network, the crosslinked polymer membranes offered excellent proton conductivity under high and low relative humidity, together with hydrolytic, dimensional, and thermal stability. © 2015 Korean Chemical Society,Seoul &Wiley-VCH Verlag GmbH &Co. KGaA,Weinheim.

Won M.,Organic Material Synthesis Laboratory | Kwon S.,Organic Material Synthesis Laboratory | Kim T.-H.,Organic Material Synthesis Laboratory
Journal of the Korean Chemical Society | Year: 2015

Proton exchange membrane (PEM), which transfers proton from the anode to the cathode, is the key component of the proton exchange membrane fuel cell (PEMFC). Nafion is widely used as PEM due to its high proton conductivity as well as excellent chemical and physical stabilities. However, its high cost and the environmental hazards limit the commercial application in PEMFCs. To overcome these disadvantages, various alternative polymer electrolytes have been investigated for fuel cell applications. We used densely sulfonated polymers to maximize the ion conductivity of the corresponding membrane. To overcome high swelling, dipole-dipole interaction was used by introducing nitrile groups into the polymer backbone. As a result, physically-crosslinked membranes showed improved swelling ratio despite of high water uptake. All the membranes with different hydrophilic-hydrophobic compositions showed higher conductivity, despite their lower IEC, than that of Nafion-117.

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