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用三种分子量大小不等的聚乙二醇单甲醚(PEGME)与甲基丙烯酸甲酯-马来酸酐共聚物[P(MMA-co-MAh)]反应,制备了三种支链长度不等的梳状共聚物(MMA/MAh-g-PEGME),并以此为基体,加入增塑剂碳酸丙烯酯(PC)和高氯酸锂(LiClO4),采用溶剂浇铸法制备了三种凝胶聚合物电解质(GPE)膜,研究了其离子传输性能,发现该聚合物凝胶电解质的离子传输机理符合VTF(Vogel-Tamman-Fulcher)方程,即离子传输性能与凝胶体系自由体积的大小有关;采用正电子湮没寿命谱仪(PALS)研究了GPE体系的自由体积特性,获得了各支链长度不同的共聚物凝胶电解质的自由体积分数,分析各自由体积与离子传输性能之间的关系,建立了共聚物结构、凝胶聚合物自由体积及其传输性能之间的关系.发现梳状共聚物支链长度越长,凝胶电解质的自由体积越大,离子传输性能越高.
Three branched lengths were prepared using three different molecular weight polyethylene glycol monomethyl ether (PEGME) with methyl methacrylate-maleic anhydride copolymer [P (MMA-co-MAh)] (MMA / MAh-g-PEGME) were prepared by the sol-gel method. The plasticizer propylene carbonate (PC) and lithium perchlorate (LiClO4) The ion transport mechanism of the polymer gel electrolyte was found to be in accordance with the Vogel-Tamman-Fulcher (VTF) equation, that is, the ion transport performance and the free volume of the gel system . The free volume of GPE system was studied by positron annihilation lifetime spectrometer (PALS). The free volume fractions of the copolymer gel electrolytes with different branch lengths were obtained. The relationship between the free volume and the ion transport capacity Relationship between the structure of the copolymer, the free volume of the gel polymer and its transmission properties found that the longer the branched chain length of the comb copolymer, the larger the free volume of the gel electrolyte, the higher the ion transport properties.