Preparation and properties of the cross-linked sulfonated polyimide containing benzimidazole as electrolyte membranes in fuel cells

被引:38
|
作者
Pan, Haiyan [1 ]
Chen, Shixiong [1 ]
Zhang, Yuanyuan [1 ]
Jin, Ming [1 ]
Chang, Zhihong [1 ]
Pu, Hongting [1 ]
机构
[1] Tongji Univ, Sch Mat Sci & Engn, Inst Funct Polymers, Shanghai 201804, Peoples R China
基金
美国国家科学基金会;
关键词
Proton exchange membrane; Sulfonated polyimide; Benzimidazole; Cross-linked; PROTON-EXCHANGE MEMBRANES; POLYBENZIMIDAZOLE; STABILITY; CONDUCTIVITY; TRANSPORT; PEMFC;
D O I
10.1016/j.memsci.2014.11.023
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Sulfonated polyimides containing benzimidazole (SPIBI) with varies sulfonation degree (DS) are synthesized by 1, 4, 5, 8-naphthalenetetracarboxylic dianhydride (NTDA), 5-amino-2-(4-aminophenyl) benzimidazole (APABI) and 4, 4'-diaminodiphenyl ether-2, 2'-disulfonic acid (ODADS). The cross-linked SPIBI membranes can be prepared with 3, 3', 5, 5'-tetramethyl-diphenyl diglycidyl ether (TMBP) as cross-linker during the following thermal treatment process. By adjusting the DS of SPIBI and the weight ratio of the crosslinker, a series of the cross-linked membranes are obtained. All the obtained membranes exhibit good cross-linking densities for the gel fractions higher than 75%. Compared to pure SPIBI membranes, the mechanical properties, oxidative and hydrolytic stabilities of the cross-linked membranes are improved significantly. For instance, the tensile strength of the cross-linked membranes is in the range of 53.6-108.4 MPa, the anti-free oxidative stability of SPIBI-80-15 (with a cross-linker content of 15 wt% and DS of 80%) is almost four times of the data of the uncross-linked SPIBI-80 which is tested by Fenton's reagent (3% H2O2, 3 ppm Fe2+) at 80 degrees C SPIBI-80-15 also exhibits much higher hydrolytic stability for more than 1440 h, while that of SPIBI-80 is 27 h in the same condition. The proton conductivity of the cross-linked membranes ranges from 10(-3) to 10(-2) cm(-1.) (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:87 / 94
页数:8
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