| 引用本文格式: Li Kang-Rui,Li Xun,Wang Shu-Heng,Liu Bi-De,Wang Li-Yun,Zhao Xin-Jun,Li Jiu-Zhi. Modeling study on the roles of co-nonsolvency in volume transition of polymer gels [J]. J. At. Mol. Phys., 2024, 41(6): 066002 (in Chinese) [李康睿,李循,王书恒,刘彼得,王利云,赵新军,李九智. 模型化研究高分子凝胶体积相变中的共非溶性作用 [J]. 原子与分子物理学报, 2024, 41(6): 066002] |
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| 模型化研究高分子凝胶体积相变中的共非溶性作用 |
| Modeling study on the roles of co-nonsolvency in volume transition of polymer gels |
| 摘要点击 155 全文点击 37 投稿时间：2023-01-04 修订日期：2023-02-06 |
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| DOI编号
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| 中文关键词
高分子凝胶 共非溶性 体积相变 |
| 英文关键词
polymer gel co-nonsolvency volume transition |
| 基金项目
国家自然科学基金 |
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| 中文摘要
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| 基于 Flory−Huggins 理论，我们建立理论模型，研究在共非溶剂(CNS)中，高分子凝胶(PG)体积相变中的共非溶性作用。理论模型考虑 PG 中 CNS 的桥接作用、各种分子的混溶效应。研究发现，当 CNS 与高分子单体间的吸引强度较小时，CNS 与高分子单体间桥接作用的减弱，会导致 PG 体积相变。当 CNS 与高分子单体间的吸引作用强度较大时，随着 CNS 与高分子单体间桥接作用的减弱，PG 的体积分数呈现两次台阶式的转变，表明 PG 体系出现两次体积相变。这是由于桥接作用的减弱，虽然会有部分 CNS 分子被排挤出 PG，但是并未完全消除 CNS 与高分子单体间的桥接吸引作用。所得理论结果符合实验观测，由此表明了共非溶性作用会在很大程度上调控 PG 的相变行为。 |
| 英文摘要
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| Based on the Flory-Huggins theory, we built a theoretical model to study the role of co-nonsolvency in the volume phase transition of polymer gel(PG) in co-nonsolvent (CNS). The theoretical model considers the bridging effect of CNS in PG and the miscibility effect of various molecules. We found that when the attraction strength between CNS and polymer monomer is low, the bridging effect between CNS and polymer monomer is weakened, which will lead to the volume phase transition of PG. When the attraction between CNS and polymer monomer is strong, with the weakening of the bridging between CNS and polymer monomer, the volume fraction of PG presents two step transitions. It indicates that the PG presents two volume transitions. Because of the weakening of the bridging effect, although some CNS molecules will be squeezed out of the gel, the bridging attraction between CNS and polymer monomer has not been completely eliminated. The theoretical results are consistent with the experimental observations, which indicates that the phase transition behavior of PG can be controlled to a large extent by the co-nonsolvency. |
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