Morphological transformation during cross-linking of a highly sulfonated poly(phenylene sulfide nitrile) random copolymer

被引:84
作者
Lee, So Young [1 ]
Kang, Na Rae [2 ]
Shin, Dong Won [1 ]
Lee, Chang Hyun [4 ]
Lee, Kwan-Soo [5 ]
Guiver, Michael D. [2 ,3 ]
Li, Nanwen [2 ]
Lee, Young Moo [1 ,2 ]
机构
[1] Hanyang Univ, Coll Engn, Sch Chem Engn, Seoul 133791, South Korea
[2] Hanyang Univ, WCU Dept Energy Engn, Seoul 133791, South Korea
[3] CNR, Ottawa, ON K1A OR6, Canada
[4] Uiduk Univ, Coll Engn, Dept Green Energy Engn, Gyeongju 780713, South Korea
[5] Honam Petrochem Corp, Daedeok Res Inst, Res Team 6, Taejon 305726, South Korea
基金
新加坡国家研究基金会;
关键词
PROTON-EXCHANGE MEMBRANE; POLYMER ELECTROLYTE MEMBRANES; POLY(ARYLENE ETHER SULFONE); FUEL-CELL SYSTEMS; CONDUCTIVITY; TEMPERATURE; PERFORMANCE; TRANSPORT; IONOMERS;
D O I
10.1039/c2ee21992a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We present a new approach of morphological transformation for effective proton transport within ionomers, even at partially hydrated states. Highly sulfonated poly(phenylene sulfide nitrile) (XESPSN) random network copolymers were synthesized as alternatives to state-of-the-art perfluorinated polymers such as Nafion (R). A combination of thermal annealing and cross-linking, which was conducted at 250 degrees C by simple trimerisation of ethynyl groups at the chain termini, results in a morphological transformation. The resulting nanophase separation between the hydrophilic and hydrophobic domains forms well-connected hydrophilic nanochannels for dramatically enhanced proton conduction, even at partially hydrated conditions. For instance, the proton conductivity of XESPSN60 was 160% higher than that of Nafion (R) 212 at 80 degrees C and 50% relative humidity. The water uptake and dimensional swelling were also reduced and mechanical properties and oxidative stability were improved after three-dimensional network formation. The fuel cell performance of XESPSN membranes exhibited a significantly higher maximum power density than that of Nafion (R) 212 under partially hydrated environments.
引用
收藏
页码:9795 / 9802
页数:8
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