Ion Channels in Sulfonated Copolymer-Grafted Nanoparticles in Ionic Liquid
Ion Channels in Sulfonated Copolymer-Grafted Nanoparticles in Ionic Liquid
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离子液体中磺化共聚物接枝纳米粒子的离子通道
DOI：
10.1039/d2sm00725h
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发表时间：
2022
期刊：
影响因子：
3.4
通讯作者：
Akcora, Pinar
中科院分区：
文献类型：
--
作者：
Li, Ruhao;Han, Yuke;Akcora, Pinar
使用离子液体作为聚合物或聚合物接枝纳米颗粒的溶剂为探索电解质-聚合物相互作用提供了令人兴奋的功能。 1-己基-3-甲基咪唑鎓双(三氟甲基磺酰基)亚胺 (HMIm–TFSI) 可以通过离子偶极力或氢键与聚合物产生特定的相互作用。在这项工作中，合成了具有不同磺化水平（~4.9 至 10.9 mol% SS）的聚（甲基丙烯酸甲酯）-b-聚（苯乙烯磺酸）（PMMA-b-PSS）共聚物接枝 Fe3O4 纳米粒子，并报告了它们在乙腈和 HMIm-TFSI/乙腈混合物中的浓度依赖性离子电导率。我们发现，电导率随着乙腈中颗粒浓度的增加而增强，这是由于接枝颗粒的聚集，导致磺酸域连接。发现离子电导率与离子通道内的有效跳跃转移有关。相反，随着 HMIm-TFSI/乙腈中颗粒浓度的增加，电导率降低或保持恒定。这一结果归因于离子液体和共聚物域之间的离子耦合。
The use of ionic liquids as solvents for polymers or polymer-grafted nanoparticles provides an exciting feature to explore electrolyte–polymer interactions. 1-Hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (HMIm–TFSI) can have specific interactions with the polymer through ion-dipole forces or hydrogen bonding. In this work, poly(methyl methacrylate)-b-poly(styrene sulfonate) (PMMA-b-PSS) copolymer-grafted Fe3O4 nanoparticles with different sulfonation levels (∼4.9 to 10.9 mol% SS) were synthesized, and their concentration dependent ionic conductivities were reported in acetonitrile and HMIm–TFSI/acetonitrile mixtures. We found that conductivity enhancement with the particle concentration in acetonitrile was due to the aggregation of grafted particles, resulting in sulfonic domain connectivity. The ionic conductivity was found to be related to the effective hopping transfer within ionic channels. On the contrary, the conductivity decreased or remained constant with increasing particle concentration in HMIm–TFSI/acetonitrile. This result was attributed to the ion coupling between ionic liquids and copolymer domains.