Embedded polymerization driven asymmetric PEM for direct methanol fuel cells
Embedded polymerization driven asymmetric PEM for direct methanol fuel cells
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DOI：
10.1016/j.memsci.2005.07.004
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发表时间：
2006-02-15
影响因子：
9.5
通讯作者：
Lee, JY
中科院分区：
文献类型：
--
作者：
Pei, HQ;Hong, L;Lee, JY
这项工作报告了质子交换膜（PEM）的制造具有更强的抗甲醇渗透比Nafion（R）117。由4-乙烯基苯酚-甲基丙烯酸甲酯共聚物组成的三组分丙烯酸聚合物共混物（TCPB）。聚（甲基丙烯酸丁酯）（PBMA）和甲基丙烯酸甲酯-丙烯酸乙酯的共聚物用作甲醇阻挡层。为了将质子源相尽可能均匀地植入膜内，亲水性单体。2-丙烯酰胺基-2-甲基丙磺酸（AMPS）、甲基丙烯酸2-羟乙酯（HEMA）和聚（乙二醇）二甲基丙烯酸酯（PEGDMA）仅在它们嵌入TCPB基质中之后聚合。嵌入聚合导致了不对称的膜结构，其中亲水网络被夹在两层具有高百分比的TCPB的基质之间。正如预期的那样，这种不对称膜结构表现出比Nafion 117更低的甲醇吸收;以及在10（-3）-10（-4）S/cm范围内的质子传导率，这取决于磺酸含量的浓度。有人建议，在这个不对称的膜中的两个外层提供主要的甲醇阻断和支持质子传导性能，而中间层提供质子和保存水。这种独特的三明治PEM结构从嵌入式聚合证实了微观结构表征和物理性能测量。(c)2005 Elsevier B. V.保留所有权利。
This work reports the fabrication of proton exchange membranes (PEM) with stronger resistance to methanol penetration than Nafion (R) 117. A three-component acrylic polymer blend (TCPB) consisting of a copolymer of 4-vinylphenol-methyl methacrylate. poly(butyl methacrylate) (PBMA) and a copolymer of methyl methacrylate-ethyl acrylate is used as the methanol barrier. In order to implant a proton source phase within the membrane as homogeneously as possible, the hydrophilic monomers. 2-acrylamido-2-methyl propanesulfonic acid (AMPS), 2-hydroxyethyl methacrylate (HEMA) and poly(ethylene glycol) dimethylacrylate (PEGDMA), are polymerized only after they have been embedded in the TCPB matrix. The embedded polymerization has resulted in an asymmetric membrane structure, in which the hydrophilic network is sandwiched by two layers of matrixes with high percentages of TCPB. As expected, this asymmetric membrane structure exhibits lower methanol uptake than Nafion (R) 117; and a proton conductivity in the range of 10(-3)-10(-4) S/cm, which is dependent on the concentration of the sulfonic acid content. It is suggested that the two external layers in this asymmetric membrane provide primarily methanol-blocking and supporting proton-conducting properties; while the middle layer supplies protons and conserves water. This unique sandwiched PEM structure from embedded polymerization is confirmed by microstructure characterizations and by physical property measurements. (c) 2005 Elsevier B.V. All rights reserved.