Effect of Added Salt on Disordered Poly(ethylene oxide)- Block -Poly(methyl methacrylate) Copolymer Electrolytes
Effect of Added Salt on Disordered Poly(ethylene oxide)- Block -Poly(methyl methacrylate) Copolymer Electrolytes
复制标题
添加盐对无序聚环氧乙烷-嵌段-聚甲基丙烯酸甲酯共聚物电解质的影响
DOI：
10.1021/acs.macromol.0c02493
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发表时间：
2021
期刊：
影响因子：
5.5
通讯作者：
Balsara, Nitash P.
中科院分区：
文献类型：
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作者：
Shah, Neel J.;Dadashi-Silab, Sajjad;Galluzzo, Michael D.;Chakraborty, Saheli;Loo, Whitney S.;Matyjaszewski, Krzysztof;Balsara, Nitash P.
我们研究了盐的加入对具有负Flory-Huggins相互作用参数χ的二嵌段共聚物系统的影响，χ指示两个嵌段之间的吸引力相互作用。研究的体系是聚（环氧乙烷）-嵌段-聚（甲基丙烯酸甲酯）（PEO-PMMA）与添加锂双（三氟甲磺酰）亚胺（LiTFSI）盐。我们研究了两种不对称嵌段共聚物，PEO-PMMA（10-33）和PEO-PMMA（10-64），其中数字是指嵌段的摩尔质量，单位为kg mol-1。PEO-PMMA（10-33）的小角X射线散射（SAXS）曲线在所有盐浓度下均无特征。相比之下，当盐浓度在0.22 ≤m（mol Li/kg聚合物）≤ 0.44之间时，PEO-PMMA（10-64）表现出SAXS峰。仅在PEO-PMMA（10-64）中出现SAXS峰与de拉克鲁斯及其同事开发的离子自洽场理论的预测一致，该理论预测在具有负χ的系统中，仅当离子嵌段的体积分数约为10%时才发现有序相。
We studied the effect of salt addition on a diblock copolymer system with a negative Flory–Huggins interaction parameter, χ, indicative of attractive interactions between the two blocks. The system studied is poly(ethylene oxide)-block-poly(methyl methacrylate) (PEO-PMMA) with added lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt. We studied two asymmetric block copolymers, PEO-PMMA(10–33) and PEO-PMMA(10–64), where the numbers refer to the molar masses of the blocks in kg mol–1. The small-angle X-ray scattering (SAXS) profiles for PEO-PMMA(10–33) were featureless at all salt concentrations. In contrast, PEO-PMMA(10–64) exhibited SAXS peaks when the salt concentration was between 0.22 ≤m(mol Li/kg polymer) ≤ 0.44. The appearance of SAXS peaks only in PEO-PMMA(10–64) is consistent with the predictions of ionic self-consistent field theory developed by de la Cruz and co-workers, which predicts that in systems with negative χ, ordered phases are only found when the volume fraction of the ionic block is about 10%.