Effect of mixed solvents on polyelectrolyte complexes with salt
Effect of mixed solvents on polyelectrolyte complexes with salt
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DOI：
10.1007/s00396-020-04637-0
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发表时间：
2020-04-08
影响因子：
2.4
通讯作者：
Tirrell, Matthew V.
中科院分区：
文献类型：
--
作者：
Meng, Siqi;Liu, Yueming;Tirrell, Matthew V.
强相互作用双金属络合物（佩奇）是一类通用的材料，其物理状态可以在盐添加后从固体驱动到液体并最终驱动到均匀溶液。然而，这些材料中的许多材料可以使用普通的一价盐显示出高稳定性，导致难以获得整个PEC谱。在这里，模型系统，由两个苯乙烯聚电解质，需要非常高的盐驱动相变。我们将驱动这些转变所需的盐量称为耐盐性。在水中，PEC在2.5 M NaBr下从固体转化为液体，并且在研究的盐范围内从未完全解离。我们发现了一种非常规的方法，通过将溶剂切换为可混溶的乙二醇/水和乙醇/水来削弱耐盐性，从而使我们能够系统地引入更多的疏水成分。利用显微镜定性地确定物理状态，我们发现更高的疏水性降低了相变和分解的耐盐性。图形摘要
Strongly interacting polyelectrolyte complexes (PECs) are a versatile class of materials whose physical states can be driven from solids into liquids and ultimately into homogenous solution upon salt addition. However, many of these materials can display high stability using common monovalent salts, leading to difficulties in accessing the entire PEC spectrum. Here, the model system, composed of two styrenic polyelectrolytes, required exceptionally high salt to drive phase transition. We term the amount of salt required to drive these transitions salt resistance. In water, the PEC transferred from solid into liquid at 2.5 M NaBr and never fully dissociated within the studied salt range. We discovered an unconventional approach of weakening salt resistance by switching the solvent to miscible ethylene glycol/water and ethanol/water, allowing us to systematically introduce more hydrophobic constituents. Employing microscopy to determine physical states qualitatively, we found that higher hydrophobicity lowered salt resistance for phase transition and disassembly.Graphical abstract