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基于烷基化反应的磺化聚砜的制备及质子交换膜性能 被引量:1

Preparation of sulfonated polysulfone via alkylation and properties of proton exchange membranes
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摘要 以聚砜为基质材料,通过Friedel-Crafts烷基化反应引入环氧基团,然后与对羟基苯磺酸钠(HBS)反应,制备一种侧链型磺化聚砜,记为PS-BS。利用红外光谱(FT-IR)和核磁氢谱(1HNMR)对其结构进行表征,利用流延成膜法制备相应的质子交换膜(PEMs),初步研究温度对PEMs性能的影响规律。结果表明,在适宜的条件下,环氧基团键合量达到2. 28 mmol/g,磺酸基团键合量达到1. 43 mmol/g,由于亲水基团远离聚合物主链,能够形成明显的'微相分离'结构,该侧链型PEMs保持较好的尺寸稳定性、吸水率和质子传导率,PS-BS-4膜在25℃和80℃的溶胀率仅为15. 2%和44. 3%,低于商业化的Nafion115膜。同时,随着温度升高,磺酸基团的运动能力增强,PEMs的吸水率、吸水溶胀率和质子传导率增大。 Epoxy group is added onto the backbone of polysulfone via Friedel-Crafts alkylation reaction.Subsequently,a kind of side chain type sulfonated polysulfone,PS-BS,is obtained via macromolecule reaction with 4-hydroxybenzenesulfonate as reagent.After fully characterizing the chemical structure of PS-BS by FT-IR and1 H-NMR,PS-BS is used to prepare corresponding proton exchange membranes(PEMs)through solution casting method.The relationship between temperature and basic properties of PEMs are studied preliminarily.The experimental result shows that the bonding amount of sulfonic group reaches up to 1.43 mmol·g-1 when the bonding amount of epoxy group reaches2.28 mmol·g-1 under appropriate reaction conditions.PEMs keep excellent size stability,wateruptaking rate and proton conductivity mainly because they form obvious micro-phase separation structure due to faraway of hydrophilic groups from main chain of polymers.The swelling ratio of PS-BS-4 is only 15.2%at 25℃and 44.3%at 80℃,lower than that of commercialized Nafion115 PEMs.Meanwhile,water uptaking,swelling ratio and proton conductivity of PEMs will increase with the enhancement of the movement ability of sulfonic group at a rising temperature.
作者 乔宗文 陈涛 QIAO Zong-wen;CHEN Tao(Collaborative Innovation Center of Chemical Engineering,Shaanxi Institute of Technology,Xi’an 710300,China;School of Chemical and Environmental Engineering,North University of China,Taiyuan 030051,China)
出处 《现代化工》 CAS CSCD 北大核心 2019年第2期149-153,155共6页 Modern Chemical Industry
基金 陕西省教育厅自然科学专项(18JK0069) 陕西国防工业职业技术学院校本项目(GZY1712).
关键词 聚砜 Friedel-Crafts烷基化 侧链型 相分离 polysulfone Friedel-Crafts alkylation reaction side chain type phase separation
作者简介 乔宗文(1987-),男,博士,讲师,研究方向为功能高分子的合成与性能研究,qiaozongwen@126.com;通讯联系人:陈涛(1979-),男,博士,讲师,研究方向为功能材料的合成与性能研究,chent2004@163.com。
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