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Kosmotropic effect leads to LCST decrease in thermoresponsive polymer solutions

机译:kosopic效应导致热响应性聚合物溶液的LCST降低

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摘要

We study the phenomena of decrease in lower critical solution temperature (LCST) with addition of kosmotropic (order-making) cosolvents in thermoresponsive polymer solutions. A combination of explicit solvent coarse-grained simulations and mean-field theory has been employed. The polymer-solvent LCST behavior in the theoretical models has been incorporated through the Kolomeisky-Widom solvophobic potential. Our results illustrate how the decrease in the LCST can be achieved by the reduction in the bulk solvent energy with the addition of cosolvent. It is shown that this effect of cosolvent is weaker with an increase in polymer hydrophilicity which can explain the absence of a LCST decrease in poly(N,N-diethylacrylamide), water, and methanol systems. The coarse-grained nature of the models indicates that a mean energetic representation of the system is sufficient to understand the phenomena of LCST decrease. Published by AIP Publishing.
机译:我们研究了在热响应性聚合物溶液中添加了kosopic(阶)的kosopic(命令)溶剂的临界溶液温度(LCST)降低的现象。 采用了明确溶剂粗粒模拟和平均场理论的组合。 理论模型中的聚合物 - 溶剂LCST行为通过Kolomeisky-Widom型溶剂潜力掺入。 我们的结果说明了LCST的减少如何通过添加彩色溶剂能量来实现。 结果表明,这种彩色剂的这种效果较弱,该效果较弱,该聚合物亲水性增加,可以解释聚(N,N-二乙基丙烯酰胺),水和甲醇体系的LCST降低。 模型的粗粒性质表明系统的平均能量表示足以理解LCST减少的现象。 通过AIP发布发布。

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