https://scholars.lib.ntu.edu.tw/handle/123456789/633367
標題: | Solidification dynamics of polymer membrane by solvent extraction: Spontaneous stratification | 作者: | Hu, Hsin Wei Tsao, Heng Kwong YU-JANE SHENG |
關鍵字: | Directional solidification | Liquid-solid separation | Nonsolvent-induced separation | Solidification dynamics | Spontaneous stratification | 公開日期: | 5-十月-2023 | 卷: | 683 | 來源出版物: | Journal of Membrane Science | 摘要: | Nonsolvent-induced phase separation is widely used to create polymer membranes, but its demixing process is generally understood by liquid-liquid separation. In this work, the solidification dynamics of polymer solutions for membrane formation are explored through dissipative particle dynamics simulations. The shrinkage of the symmetric film of polymer solution is monitored, and the evolutions of the concentration profiles of polymer, solvent, and nonsolvent are analyzed. Additionally, the evolution of the degree of crystallinity (local alignment) and the morphology of the developing membrane are also studied. Three regions can be identified: (i) interfacial region, (ii) dense layer, and (iii) middle region. The demixing process associated with liquid-solid separation is found to be caused by the extraction of solvent and concentration of polymers rather than nonsolvent-induced separation. Our results provide valuable insights into directional solidification and spontaneous stratification of the membrane, driven by solvent loss and oversaturation (beyond the maximum solubility of polymer). |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/633367 | ISSN: | 03767388 | DOI: | 10.1016/j.memsci.2023.121846 |
顯示於: | 化學工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。