有机膦酸掺杂聚乙烯醇电解质膜的制备与性能

Preparation and Characterization of Organophosphorus Acids-Doped Polyvinyl Alcohol Membranes

以聚乙烯醇(PVA)为基体,戊二醛(GA)为交联剂,通过溶液浇注法,将3种有机膦酸(OPA)2-羟基膦酸基乙酸(HPAA)、2-膦酸丁烷-1,2,4-三羧酸(PBTCA)、氨基三亚甲基膦酸(ATMP)掺杂到聚乙烯醇中,制备新型的磷酸化质子交换膜。利用傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)、热重分析(TGA)、交流阻抗谱等对磷酸化质子交换膜的结构和性能进行了研究。结果表明,OPA的加入使PVA结构由晶态向非晶态转变,且有效地提高了PVA复合膜的质子电导率,并随着OPA含量的增加,其质子电导率也随之增加,当OPA的质量分数为6.7%时,室温下,其电导率最高可达5.79×10-3S/cm,膜的力学性能有一定的下降。

A novel type of phosphorylated proton exchange membrane was prepared via solution casting. The three kinds of organophosphonic acids （OPAs） including 2-hydroxyphosphonocarboxylic acid （HPAA）, 2-phosphonobutane -1,2,4-tricarboxylic acid （PBTCA） and amino trimethylene phosphonic acid （ATMP） were added into polyvinyl alcohol matrix by using glutaraldehyde as crosslinked agent. The structure and properties of the membranes were investigated by FT-IR, XRD, TGA, EIS. The results show that the structure of PVA transforms from crystalline state to amorphous state and the proton conductivity of PVA composite films is improved effectively by adding OPA, and the proton conductivity increases with the raise of OPA content. When the mass fraction of OPA is 6.7%, the proton conductivity is up to 5.79×10-3 S cm-1 at room temperature, while the mechanical properties of PVA films decline to some extent.