摘要
sulfonated (醚醚酉同类)(SPEEK ) poly,有 sulfonation (DS ) 的相当高的度的膜过分地胀大并且甚至溶解在高温度。解决这些问题, sulfonated 酚酞 poly (醚 sulfone )(SPES-C, DS53.7%) 与 SPEEK 矩阵被混合(DS55.1% , 61.7%) 准备 SPEEK/SPES-C 混合膜。在胀大的度和膜的甲醇渗透的减少是剂量依赖者。纯 SPEEK (DS61.7%) 膜在 70 ° 在水里完全溶解; C SPEEK (DS61.7%)/SPES-C 的胀大的度(40% ,由质量) 膜在 80 ° 是 29.7% ; C。从房间温度到 80 °; C,所有 SPEEK (DS55.1%)/SPES-C 混合膜的甲醇渗透比 Nafion® 的低大约一个数量级; 115。在更高的温度, SPES-C 聚合物的增加增加维的稳定性和更大的质子电导率能被完成。SPEEK (DS=55.1%)/SPES-C (40% ,由质量) 膜能承受温度直到 150 °; C。SPEEK (DS55.1%)/SPES-C 的质子电导率(30% ,由质量) 膜接近 0.16 S·;匹配 Nafion® 的厘米 <sup>−1</sup>, ; 115 在 140 °; C 和 100% RH,当纯 SPEEK (DS55.1%) 膜溶解在 90 ° 时; C。因为他们的好维的稳定性,高质子传导性,和低甲醇渗透, SPEEK/SPES-C 混合膜为在直接甲醇燃料房间的使用是有希望的。
A sulfonated poly(ether ether ketone) (SPEEK) membrane with fairly high degree of sulfonation (DS) swells excessively and even dissolves at high temperature. To solve these problems, sulfonated phenolphthalein poly(ether sulfone) (SPES-C, DS= 53.7%) is blended with the SPEEK matrix (DS= 55.1%, 61.7%) to prepare SPEEKJSPES-C blend membrane. The decrease in swelling degree and methanol permeability of the membrane is dose-dependent. Pure SPEEK (DS = 61.7%) membrane dissolves completely in water at 70℃, whereas the swelling degree of the SPEEK (DS = 61.7%)/SPES-C (40%, by mass) membrane is 29.7% at 80℃. From room temperature to 80℃, the methanol permeability of all SPEEK (DS = 55.1%)/SPES-C blend membranes is about one order of magnitude lower than that of Nafion 115. At higher temperature, the addition of SPES-C polymer increases the dimensional stability and greater proton conductivity can be achieved. The SPEEK (DS = 55.1%)/SPES-C (40%, by mass) membrane can withstand temperatures up to 150℃. The proton conductivity of SPEEK (DS = 55.1%)/SPES-C (30%, by mass) membrane approaches 0.16 S·cm^-1, matching that of Nafion 115 at 140℃ and 100% RH, while pure SPEEK (DS = 55.1%) membrane dissolves at 90℃. The SPEEK/SPES-C blend membranes are promising for use in direct methanol fuel cells because of their good dimensional stability, high proton conductivity, and low methanol permeability.
基金
Supported by the State Key Development Program for Basic Research of China (2008CB617502), the National Natural Science Foundation of China (20606025), and Program for Changjiang Scholars and Innovative Research Team in University of China (IRT0641).
关键词
聚醚醚酮
磺化度
共混膜
聚醚砜
DMFC
质子交换
NAFION膜
尺寸稳定性
sulfonated poly(ether ether ketone), sulfonated phenolphthalein poly(ether sulfone), blend membrane,direct methanol fuel cell