| Cite this article as: 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.(原子与分子物理学报), 2024, 41: 066002 (in Chinese) |
| Modeling study on the roles of co-nonsolvency in volume transition of polymer gels |
| Hits 163 Download times 38 Received:January 04, 2023 Revised:February 06, 2023 |
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| Key Words
polymer gel co-nonsolvency volume transition |
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| Abstract
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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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