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Effect of Hydrophilic Chain Segment on Properties of Sulfonated Polysulfone Proton Exchange Membranes

Authors： QIAO Zongwen

Units： Department of Chemical Engineering , Shaanxi Institute of Technology, Xian 710300, China

KeyWords： Polysulfone, Naphthalenesulfonic acid type, Pyrenesulfonic type, Phase separation, Size stability.

ClassificationCode：O631

year,volume(issue):pagination： 2020,40(4):49-54

Abstract：

Based on the preparation of chloromethylated polysulfone(CMPSF), two kinds of side chain type sulfonated polysulfone, naphthalenesulfonic acid type polysulfone(PSF-NS) and pyrenesulfonic acid type polysulfone（PSF-TS） with different hydrophilic chain segments were successfully prepared via nulecophilic substitution with 2-naphthol-6,8-disulfonic acid dipotassium(NS) and 8-hydroxy-1,3,6-pyrene trisulfonic acid sodium(TS) as reagents, respectively. After characterizing their structure by the FT-IR and 1H-NMR, the corresponding PSF-NS and PSF-TS PEMs were obtained by solution casting method. The effect of hydrophilic segment structure on performance including water sorption, size stability and proton conductivity of PEMs at the same bonding amount of sulfonic group were explored. The result put up PSF-NS and PSF-TS PEMs keep excellent size stability, antioxidative stability and anti-methanol permeability at high water sorption because they could form micro-phase separation structure similar to Nafion membrane due to the hydrophilic sulfonic acid group far away from hydrophobic polysulfone main chain.With the same bonding amount of sulfonic acid, PSF-TS has a higher water absorption efficiency due to less hydrophilic chain segment and a larger number of sulfonic acid group PSF in the hydrophilic chain segment, which is conducive to the aggregation of absorbed water and the more obvious phase separation structure. It leads to the PSF-TS present better size stability and anti-oxidative at high water sorption. The swelling ratio of PSF-TS-3 PEM was only 20.3% and 48.1%. Meanwhile, the methanol permeability was only 7.54×10-7cm2·s-1 at room temperature, much lower than commercialization Nafion115 PEM (16.8×10-7cm2/s at room temperature) at the same condition. The PEM is expected to be used in the practical application of fuel cell. The research results are of great significance for the design and preparation of high-performance membrane materials.

Funds：

陕西省自然科学基金项目（2019JQ-927）、陕西省教育厅自然科学研究计划项目（18JK0069）和陕西国防学院自然科学研究计划（Gfy18-04）项目资助

AuthorIntro：

第一作者简介：乔宗文（1987-），男，江苏连云港人，博士研究生，副教授，研究方向：功能高分子的合成及性能研究，Tel：15929899061, Email:qiaozongwen@126.com

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