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首页> 外文期刊>Journal of Applied Polymer Science >EFFECT OF EVAPORATION TIME ON THE PERVAPORATION CHARACTERISTICS THROUGH HOMOGENEOUS AROMATIC POLYAMIDE MEMBRANES .1. PURE WATER PERMEATION AND MEMBRANE CHARACTERIZATION BY SORPTION MEASUREMENTS
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EFFECT OF EVAPORATION TIME ON THE PERVAPORATION CHARACTERISTICS THROUGH HOMOGENEOUS AROMATIC POLYAMIDE MEMBRANES .1. PURE WATER PERMEATION AND MEMBRANE CHARACTERIZATION BY SORPTION MEASUREMENTS

机译：蒸发时间对均相芳族聚酰胺膜渗透性能的影响1。吸附法测定纯净水的渗透性和膜特性

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The pervaporation of pure water through homogeneous aromatic polyamide membranes was investigated. The structure of the prepared membranes was controlled by varying the solvent evaporation times before the gelation step from 5 min to 240 min. The permeation flux of pure water decreased rapidly when the solvent evaporation time increased from 5 min to 30 min, and the decrease was rather moderate at higher evaporation times. Vapor and liquid sorption measurements were used to characterize the membranes. The amount of vapor sorption at a given relative pressure increased with an increase in the solvent evaporation time. The specific surface area of the membranes, calculated from the vapor sorption isotherm, increased with evaporation time up to 30 min, and remained constant thereafter. Liquid sorption volume, on the other hand, decreased monotonically with an increase in evaporation time. The formation of channels in the membrane is used to explain the morphology change during the solvent evaporation. The increase in the solvent evaporation time gradually increases the number of the channels in the membrane and decreases their average size. Good correlation was observed between the average size of the channels (represented by the ratio of specific volume to the specific surface area) and the parameters associated with pervaporation transport. (C) 1995 John Wiley and Sons, Inc. [References: 13]
机译：研究了纯水通过均质芳族聚酰胺膜的渗透作用。通过在胶凝步骤之前将溶剂蒸发时间从5分钟改变为240分钟来控制所制备的膜的结构。当溶剂蒸发时间从5分钟增加到30分钟时，纯水的渗透通量迅速降低，而蒸发时间越长，通量的下降幅度就越小。蒸气和液体吸附测量用于表征膜。在给定的相对压力下，蒸气吸附量随溶剂蒸发时间的增加而增加。由蒸气吸附等温线计算的膜的比表面积，随着蒸发时间的增加而增加，直至30分钟，此后保持恒定。另一方面，随着蒸发时间的增加，液体吸附体积单调减少。膜中通道的形成用于解释溶剂蒸发过程中的形态变化。溶剂蒸发时间的增加逐渐增加了膜中通道的数量，并减小了其平均尺寸。在通道的平均尺寸（由比体积与比表面积之比表示）和与全蒸发传输有关的参数之间观察到良好的相关性。 （C）1995 John Wiley and Sons，Inc. [参考：13]

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