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首页> 外文期刊>Journal of Applied Polymer Science >Phase separation mechanism during membrane formation by dry-cast process
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Phase separation mechanism during membrane formation by dry-cast process

机译：干法成膜过程中的相分离机理

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Phase separation mechanisms during the membrane formation by dry-cast process were investigated by light scattering in the cellulose acetate/dimethylformamide (DMF)/2-methyl-2,4-pentanediol system. Phase separation occurred by spinodal decomposition (SD) when paths of the composition changes due to the evaporation of DMF were close to the critical point in the phase diagram. Characteristic properties of the early stage of SD such as an apparent diffusion coefficient and an interface periodic distance were obtained from the Cahn theory. Phase separation occurred by nucleation and growth (NG) when paths of the composition changes were far from the critical point. SEM observation confirmed that the membrane formed by the SD mechanism had interconnected structure, whereas that by the NG mechanism had the closed cell porous structure. (C) 2000 John Wiley & Sons, Inc. [References: 30]
机译：通过醋酸纤维素/二甲基甲酰胺（DMF）/ 2-甲基-2,4-戊二醇体系中的光散射研究了干法成膜过程中的相分离机理。当由于DMF的蒸发而导致成分变化的路径接近相图中的临界点时，通过旋节线分解（SD）发生了相分离。从Cahn理论获得了SD早期的特征，如表观扩散系数和界面周期距离。当组成变化的路径远离临界点时，相分离是通过成核和生长（NG）发生的。 SEM观察证实，通过SD机理形成的膜具有互连结构，而通过NG机理形成的膜具有闭孔多孔结构。 （C）2000 John Wiley＆Sons，Inc. [参考：30]

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