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arXiv 2409.09229cond-mat.soft
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多分散聚合物在相间中的分数化

Polydisperse polymer fractionation between phases

Omenn-Darling Bioengineering Institute, Princeton University(普林斯顿大学奥门-达林生物工程学院);Department of Chemistry, Princeton University(普林斯顿大学化学系);Department of Mechanical and Aerospace Engineering, Princeton University(普林斯顿大学机械与航空航天工程系)

J. Pedro de Souza, William M. Jacobs, Howard A. Stone

AI总结:

研究多分散聚合物在不同分子量分布下的相间分数化机制,通过Flory-Huggins理论分析分子量分布对相行为的影响,提供系统评估相共存中分子量分布的方法。

摘要:

聚合物混合物在相间中根据分子量进行分数化。通过调节溶剂条件,可将多分散聚合物样品分离至不同相中,以获得特定的分子量分布。尽管基于物理的预测理论可指导分离设计和解释实验相图及分数化测量,但应用标准Flory-Huggins模型通常需要数值计算,这会阻碍考虑完整分子量分布的预测。本文应用了最近推导的多组分Flory-Huggins理论的精确解析解,用于理解常见分子量分布下的聚合物分数化原理。与之前研究一致,该方法强调了分子量分布形状(尤其是尾部)对聚合物分数化敏感性。本研究结果提供了一种系统的方法,用于在可能的组成空间内评估相共存计算中的完整分子量分布。

英文摘要:

Polymer mixtures fractionate between phases depending on their molecular weight. Consequently, by varying solvent conditions, a polydisperse polymer sample can be separated between phases so as to achieve a particular molecular weight distribution in each phase. In principle, predictive physics-based theories can help guide separation design and interpret experimental phase-diagram and fractionation measurements. Even so, applying the standard Flory-Huggins model can require numerical computations that hamper the predictions considering the full molecular weight distribution. Here, we apply a recently-derived exact analytical solution of multi-component Flory-Huggins theory for polydisperse homopolymers to understand the principles of polymer fractionation for common molecular weight distributions. Consistent with previous studies, the method highlights the sensitivity of polymer fractionation to the shape, and in particular the tails, of this distribution. Our results provide a systematic approach to evaluate the full molecular weight distribution in phase coexistence calculations over the possible composition space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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