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在高盐和高聚合物度下,强大的多电解质复合物的分离相分离

Conner H Chee¹, Rotem Benharush¹, Lexi R Knight¹

¹Department of Chemistry, University of Pittsburgh, 219 Parkman Ave, Pittsburgh, PA, USA. j.laaser@pitt.edu.

|October 17, 2024

概括

高度的盐在聚电解质复合物 (PEC) 中诱导相分离,使水聚合物 (PSS) 脱离溶液. 这种行为扩展到高度的部分中和复合物.

科学领域:

聚合物科学聚合物科学
物理化学物理化学
材料科学材料科学材料科学

背景情况:

聚电解质复合物和协体 (PECs) 的相位行为在低盐度下被理解.
在高盐度,比二极管以上的PECs的行为还不太清楚.
在高盐和高聚合物度体系中研究PEC对于基本理解至关重要.

研究的目的:

为了研究在高盐和高聚合物度下测量聚硫酸/聚二甲基 (PSS/PDADMA) 混合物的相位行为.
了解在这些条件下推动PEC相位分离的分子尺度因素.

主要方法:

通过直接与水和KBr盐混合,制备PSS/PDADMA PEC.
在盐度大约在二极管上方1M时观察相位分离.
使用热重力测量分析 (TGA),里埃变换红外光谱学 (FTIR) 和核磁共振 (NMR) 的表征.

主要成果:

在高盐度下观察到相分离.
这两种分离的阶段都含有大量的聚合物.
富含聚合物的阶段富含PSS,而缺乏聚合物的阶段富含PDADMA.
在最高度下,富含聚合物的阶段含有PSS和PDADMA.

结论:

高度的盐促进了疏水性PSS多电解质的"脱盐".
这种脱盐效应与在弱聚电解质系统中观察到的结果一致.
高度的盐还可以诱导部分中和的PEC的相分离.
在高度极限中研究PEC提供了对相分离机制的见解.

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