Highly reinforced pore-filling membranes based on sulfonated poly(arylene ether sulfone)s for high-temperature/low-humidity polymer electrolyte membrane fuel cells
Highly reinforced pore-filling membranes based on sulfonated poly(arylene ether sulfone)s for high-temperature/low-humidity polymer electrolyte membrane fuel cells
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DOI：
10.1016/j.memsci.2017.05.014
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发表时间：
2017-09-01
影响因子：
9.5
通讯作者：
Lee, Jong-Chan
中科院分区：
文献类型：
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作者：
Kim, Kihyun;Kim, Sung-Kon;Lee, Jong-Chan
通过用不同磺化程度的磺化聚亚芳基醚砜(SPAES)浸渍多孔交联苯并恶嗪-苯并咪唑共聚物P(pBUa-co-BI)基底制备了一系列孔填充膜，用于在高温(>100℃)和低湿(<50%RH)条件下运行的聚合物电解质膜燃料电池。 SPAESs是通过4,4'-二羟基联苯与不同比例的二磺酸盐-4,4'-二氟二苯砜和4,4'-二氟二苯砜的混合物反应合成的。通过使用甲醇提取P(pBUa-co-BI)膜中包含的邻苯二甲酸二丁酯(DBP)来制备多孔P(pBUa-co-BI)基材。 P(pBUa-co-BI)膜是通过将含有聚[2,2'-(间亚苯基)-5,5'-联苯并咪唑](PBI)、3-苯基-3,4-二氢-6-叔丁基-2H-1,3-苯并恶嗪(pBUa)和DBP的混合物的流延N,N-二甲基乙酰胺溶液逐步加热至220℃来制备的。与 SPAES 膜相比，孔填充膜的尺寸稳定性和机械强度大大提高。虽然孔填充膜的质子电导率值略小于SPAES膜，但在120℃和40％RH条件下，其电池性能优于SPAES膜，因为可以制备具有高机械强度的超薄孔填充膜（15-20μm），并且它们可以含有更大含量的化学结合水。
A series of pore-filling membranes are prepared by impregnating porous cross-linked benzoxazine-benzimidazole copolymer P(pBUa-co-BI) substrates with sulfonated poly(arylene ether sulfone)s (SPAES) s having different degree of sulfonation for polymer electrolyte membrane fuel cells operating at high-temperatures (> 100 degrees C) and low-humidity (< 50% RH) conditions. The SPAESs are synthesized by reacting 4,4'-dihydroxybiphenyl with the mixtures of disulfonate-4,4'-difluorodiphenylsulfone and 4,4'-difluorodiphenylsulfone in different ratios. The porous P(pBUa-co-BI) substrates are prepared by extracting dibutyl phthalate (DBP) included in P(pBUa-co-BI) films using methanol. The P(pBUa-co-BI) films are prepared by stepwise heating the casted N, N-dimethylacetamide solution containing the mixtures of poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole] (PBI), 3-phenyl-3,4-dihydro- 6-tert-butyl-2H-1,3-benzoxazine (pBUa), and DBP to 220 degrees C. The pore-filling membranes are found to have much improved dimensional stability and mechanical strength compared with the SPAES membranes. Although the proton conductivity values of the pore-filling membranes are slightly smaller than those of the SPAES membrane, their cell performance is superior to that of the SPAES membrane at 120 degrees C and 40% RH conditions because ultrathin pore-filling membranes (15-20 mu m) having high mechanical strength can be prepared and they can contain a larger content of chemically-bound water.