甲酰胺
膜
醋酸纤维素
丙酮
溶剂
化学工程
相位反转
高分子化学
铸造
多孔性
纤维素
反渗透
材料科学
化学
有机化学
复合材料
工程类
生物化学
作者
H. Strathmann,P. Scheible,Richard W. Baker
标识
DOI:10.1002/app.1971.070150404
摘要
Abstract An attempt has been made to rationalize the variables in the preparation procedure of Loeb‐Sourirajan‐type reverse‐osmosis membranes. The quaternary phase diagram of the system cellulose acetate–acetone–formamide–water was determined and has proved a useful tool in the discussion of membrane structures and properties. A mechanism based on differences in the precipitation rate of the polymer during the membrane formation process has been suggested to explain the observed asymmetry in the membrane structure. The porosity of the membrane has been ascribed to the relative rates of water entering and solvent leaving the cast film. The effects of the casting solution composition, the evaporation time, the wash bath temperature, and the annealing procedure have been studied. X‐Ray diffraction and electron microscopy were used to supplement flux and retention data of membranes made from a cellulose acetate–formamide–acetone casting solution.
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