File Download

There are no files associated with this item.

  • Find it @ UNIST can give you direct access to the published full text of this article. (UNISTARs only)
Related Researcher

이상영

Lee, Sang-Young
Energy Soft-Materials Lab.
Read More

Views & Downloads

Detailed Information

Cited time in webofscience Cited time in scopus
Metadata Downloads

Nanoscale Phase Separation of Sulfonated Poly(arylene ether sulfone)/Poly(ether sulfone) Semi-IPNs for DMFC Membrane Applications

Author(s)
Kwon, Yo HanKim, Sung ChulLee, Sang-Young
Issued Date
2009-07
DOI
10.1021/ma900781c
URI
https://scholarworks.unist.ac.kr/handle/201301/6219
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=67651102526
Citation
MACROMOLECULES, v.42, no.14, pp.5244 - 5250
Abstract
Unprecedented improvement in the selectivity (the ratio of proton conductivity to methanol permeability) of DMFC (direct methanol fuel cell) membranes has been demonstrated with a value roughly 16 times higher than that of Nafion117 having been achieved. The novel morphology of semi-interpenetrating polymer network (semi-IPN) membranes characterized by nanometer-sized domains as well as welldeveloped phase cocontinuity is a key factor in enabling such notable progress, which has not been seen in conventional microscale phase separation. The semi-IPN membranes (sIPN-100) consisted of a hydrophilic component acting as a proton conductor, that is, acrylate-terminated fully sulfonated poly(arylene ether sulfone) oligomers (acSPAES-100, degree of sulfonation=100%), and a hydrophobic component functioning as a methanol barrier, that is, poly(ether sulfone) copolymers (RH-2000). We determined the nanoscale phase separation of sIPN-100 by deliberately controlling the kinetics (the change of solvent-evaporation conditions) as well as the thermodynamics (shift of the phase separation boundary to the lower concentration of solvent in the phase diagram, mostly driven by the low molecular weight and the low hydrophilicity of acSPAES-100). Finally, the influence of this unique morphology on the membrane transport properties including the proton conductivity, the methanol permeability, and, more notably, the selectivity, was systematically investigated.
Publisher
AMER CHEMICAL SOC
ISSN
0024-9297

qrcode

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.