2025-12-17 東京大学
高分子の溶媒中・溶媒除去中の凝集の分子動力学シミュレーション
＜関連情報＞
- https://www.t.u-tokyo.ac.jp/press/pr2025-12-17-001
- https://www.t.u-tokyo.ac.jp/hubfs/press-release/2025/1217/001/text.pdf
- https://pubs.acs.org/doi/10.1021/acsomega.5c05389
水-有機二成分溶媒系におけるポリマーコイル形成の分子動力学研究 Molecular Dynamics Study of Polymer Coiling in a Water–Organic Binary Solvent System
Shinya Kawakami,Ryuhei Sato,Hirotaka Ejima,Takahiro Ujii,Koichi Sato,Takanori Ichiki,Yasushi Shibuta
ACS Omega Published: December 12, 2025
DOI:https://doi.org/10.1021/acsomega.5c05389
Abstract
To investigate how solvents influence the intrachain coiling and interchain aggregation of polymers, we performed coarse-grained molecular dynamics simulations with varying polymer–solvent interactions. In the case of pure solvents, strong polymer–solvent interactions led to well-dispersed chains without polymer coiling, while weaker interactions resulted in spontaneous chain aggregation. In a binary solvent system composed of an aqueous solvent and an organic solvent, polymer aggregation preferentially occurred in the organic-rich domains following phase separation of these solvents. Notably, polymer aggregation was absent in the pure organic solvent with a strong polymer affinity, indicating that phase separation between organic and aqueous solvents plays a role in promoting polymer aggregation and subsequent coiling. To mimic the solvent evaporation process during polymer film formation, we gradually removed solvent molecules and analyzed changes in the coiling and aggregation of the polymer chains. When polymer–solvent interactions were strong, solvent molecules tended to remain between polymer chains during evaporation, preventing full coiling. In contrast, when interactions were weak or moderate, polymers aggregated as the number of remaining solvent molecules decreased, resulting in comparable levels of aggregation regardless of the solvent strength. These results show that polymer–solvent affinity critically affects the polymer coiling, both in solvent and during solvent removal.
