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Lee, Sang-Young
Energy Soft-Materials Lab (ESML)
Research Interests
  • Soft Materials for Energy Storage/ Conversion Systems


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

DC Field Value Language Kwon, Yo Han ko Kim, Sung Chul ko Lee, Sang-Young ko 2014-09-18T02:29:08Z - 2014-09-18 ko 2009-07 -
dc.identifier.citation MACROMOLECULES, v.42, no.14, pp.5244 - 5250 ko
dc.identifier.issn 0024-9297 ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.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. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher AMER CHEMICAL SOC ko
dc.subject Concentration of ko
dc.subject Degree of sulfonation ko
dc.subject Hydrophilic components ko
dc.subject Hydrophobic components ko
dc.subject Key factors ko
dc.subject Low molecular weight ko
dc.subject Methanol barriers ko
dc.subject Methanol permeability ko
dc.subject Micro-scale ko
dc.subject Nano-scale phase separation ko
dc.subject Phase separation boundary ko
dc.subject Poly(ether sulfone) ko
dc.subject Proton conductors ko
dc.subject Ratio of proton conductivity to methanol permeability ko
dc.subject Semi-interpenetrating polymer network (semi-IPN) ko
dc.subject Semi-IPN ko
dc.subject Sulfonated poly(arylene ether sulfone) ko
dc.title Nanoscale Phase Separation of Sulfonated Poly(arylene ether sulfone)/Poly(ether sulfone) Semi-IPNs for DMFC Membrane Applications ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-67651102526 ko
dc.identifier.wosid 000268175800045 ko
dc.type.rims ART ko
dc.description.wostc 29 *
dc.description.scopustc 28 * 2015-05-06 * 2014-09-18 *
dc.identifier.doi 10.1021/ma900781c ko
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